juju status panic() when unable to parse .jenv

While investigating bug #1307677, I tried changing my local.jenv file to make it connect directly to the state server. I ended up getting:

$ juju status -e localkvm --debug
2014-04-24 11:45:08 INFO juju.cmd supercommand.go:296 running juju-1.19.1-trusty-amd64 [gc]
2014-04-24 11:45:08 DEBUG juju.conn api.go:185 trying cached API connection settings
2014-04-24 11:45:08 INFO juju.conn api.go:264 connecting to API addresses: [127.0.0.1:17017]
2014-04-24 11:45:08 INFO juju.state.api apiclient.go:198 dialing "wss://127.0.0.1:17017/"
2014-04-24 11:45:08 DEBUG juju.state.api apiclient.go:204 error dialing "wss://127.0.0.1:17017/", will retry: websocket.Dial wss://127.0.0.1:17017/: dial tcp 127.0.0.1:17017: connection refused
panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xb code=0x1 addr=0x0 pc=0x4e06c1]

goroutine 9 [running]:
runtime.panic(0xc4aa20, 0x18db528)
 /usr/lib/go/src/pkg/runtime/panic.c:266 +0xb6
launchpad.net/juju-core/environs/config.(*Config).mustString(0x0, 0xd7b1e0, 0x4, 0xc210060918, 0x0)
 /home/jameinel/dev/go/src/launchpad.net/juju-core/environs/config/config.go:424 +0x31
launchpad.net/juju-core/environs/config.(*Config).Type(0x0, 0xc210060900, 0x430edf)
 /home/jameinel/dev/go/src/launchpad.net/juju-core/environs/config/config.go:444 +0x3b
launchpad.net/juju-core/environs.New(0x0, 0xc210134420, 0x0, 0x7fc32ceb5201, 0xc210125300)
 /home/jameinel/dev/go/src/launchpad.net/juju-core/environs/open.go:161 +0x27
launchpad.net/juju-core/juju.apiConfigConnect(0x7fc32ceb51e0, 0xc2100519a0, 0xc210129420, 0x7fff2d0496e6, 0x8, ...)
 /home/jameinel/dev/go/src/launchpad.net/juju-core/juju/api.go:301 +0x108
launchpad.net/juju-core/juju.func·003(0xc210134420, 0x0, 0x0, 0x0, 0x0)
 /home/jameinel/dev/go/src/launchpad.net/juju-core/juju/api.go:196 +0x6b
launchpad.net/juju-core/utils/parallel.func·005()
 /home/jameinel/dev/go/src/launchpad.net/juju-core/utils/parallel/try.go:135 +0x41
created by launchpad.net/juju-core/utils/parallel.(*Try).loop
 /home/jameinel/dev/go/src/launchpad.net/juju-core/utils/parallel/try.go:86 +0x9f

goroutine 1 [chan receive]:
launchpad.net/tomb.(*Tomb).Wait(0xc210051850, 0xc210126420, 0xc210081a00)
 /home/jameinel/dev/go/src/launchpad.net/tomb/tomb.go:110 +0x42
launchpad.net/juju-core/utils/parallel.(*Try).Result(0xc210051850, 0xc21012a300, 0x0, 0x0, 0x0)
 /home/jameinel/dev/go/src/launchpad.net/juju-core/utils/parallel/try.go:192 +0x2e
launchpad.net/juju-core/juju.newAPIFromStore(0x7fff2d0496e6, 0x8, 0x7fc32ceb5138, 0xc2101094d0, 0xf2bc00, ...)
 /home/jameinel/dev/go/src/launchpad.net/juju-core/juju/api.go:199 +0x3d7
launchpad.net/juju-core/juju.newAPIClient(0x7fff2d0496e6, 0x8, 0xc2100b5b60, 0x0, 0x0)
 /home/jameinel/dev/go/src/launchpad.net/juju-core/juju/api.go:125 +0x7b
launchpad.net/juju-core/juju.NewAPIClientFromName(0x7fff2d0496e6, 0x8, 0x0, 0x0, 0x0)
 /home/jameinel/dev/go/src/launchpad.net/juju-core/juju/api.go:84 +0x31
main.(*StatusCommand).Run(0xc2100da3c0, 0xc2100bd140, 0x0, 0x0)
 /home/jameinel/dev/go/src/launchpad.net/juju-core/cmd/juju/status.go:77 +0xb7
main.envCmdWrapper.Run(0x7fc32ceb39d0, 0xc2100da3c0, 0xc2100bd140, 0x7fc32cd1d190, 0x2)
 /home/jameinel/dev/go/src/launchpad.net/juju-core/cmd/juju/main.go:162 +0x48
main.(*envCmdWrapper).Run(0xc210036ce0, 0xc2100bd140, 0x14, 0x7fc32cd1d190)
 /home/jameinel/dev/go/src/launchpad.net/juju-core/cmd/juju/addmachine.go:1 +0x9a
launchpad.net/juju-core/cmd.(*SuperCommand).Run(0xc2100cd780, 0xc2100bd140, 0xc2100bd140, 0x0)
 /home/jameinel/dev/go/src/launchpad.net/juju-core/cmd/supercommand.go:297 +0x439
launchpad.net/juju-core/cmd.Main(0x7fc32ceb4e00, 0xc2100cd780, 0xc2100bd140, 0xc21000a010, 0x4, ...)
 /home/jameinel/dev/go/src/launchpad.net/juju-core/cmd/cmd.go:244 +0x283
main.Main(0xc21000a000, 0x5, 0x5)
 /home/jameinel/dev/go/src/launchpad.net/juju-core/cmd/juju/main.go:135 +0x44c2
main.main()
 /home/jameinel/dev/go/src/launchpad.net/juju-core/cmd/juju/main.go:177 +0x44

goroutine 3 [syscall]:
os/signal.loop()
 /usr/lib/go/src/pkg/os/signal/signal_unix.go:21 +0x1e
created by os/signal.init·1
 /usr/lib/go/src/pkg/os/signal/signal_unix.go:27 +0x31

goroutine 6 [select]:
launchpad.net/juju-core/utils/parallel.(*Try).loop(0xc210051850, 0x0, 0x8a8b70, 0xc210052700, 0x443452)
 /home/jameinel/dev/go/src/launchpad.net/juju-core/utils/parallel/try.go:83 +0x30f
launchpad.net/juju-core/utils/parallel.func·004()
 /home/jameinel/dev/go/src/launchpad.net/juju-core/utils/parallel/try.go:62 +0x54
created by launchpad.net/juju-core/utils/parallel.NewTry
 /home/jameinel/dev/go/src/launchpad.net/juju-core/utils/parallel/try.go:65 +0x1b3

goroutine 7 [chan receive]:
launchpad.net/tomb.(*Tomb).Wait(0xc210051cb0, 0xc210134540, 0x4e7b00)
 /home/jameinel/dev/go/src/launchpad.net/tomb/tomb.go:110 +0x42
launchpad.net/juju-core/utils/parallel.(*Try).Result(0xc210051cb0, 0xc210134660, 0x0, 0x8bb2c97001, 0x77359400)
 /home/jameinel/dev/go/src/launchpad.net/juju-core/utils/parallel/try.go:192 +0x2e
launchpad.net/juju-core/state/api.Open(0xc2101344e0, 0x2faf080, 0x8bb2c97000, 0x77359400, 0x0, ...)
 /home/jameinel/dev/go/src/launchpad.net/juju-core/state/api/apiclient.go:139 +0x326
launchpad.net/juju-core/juju.defaultAPIOpen(0xc2101344e0, 0x2faf080, 0x8bb2c97000, 0x77359400, 0x20, ...)
 /home/jameinel/dev/go/src/launchpad.net/juju-core/juju/api.go:117 +0x4a
launchpad.net/juju-core/juju.apiInfoConnect(0x7fc32ceb5138, 0xc2101094d0, 0x7fc32ceb51e0, 0xc2100519a0, 0xf2bc00, ...)
 /home/jameinel/dev/go/src/launchpad.net/juju-core/juju/api.go:271 +0x2c7
launchpad.net/juju-core/juju.func·002(0xc210134420, 0x436a6f, 0x18ff140, 0x100000000, 0x100000200)
 /home/jameinel/dev/go/src/launchpad.net/juju-core/juju/api.go:187 +0x56
launchpad.net/juju-core/utils/parallel.func·005()
 /home/jameinel/dev/go/src/launchpad.net/juju-core/utils/parallel/try.go:135 +0x41
created by launchpad.net/juju-core/utils/parallel.(*Try).loop
 /home/jameinel/dev/go/src/launchpad.net/juju-core/utils/parallel/try.go:86 +0x9f

goroutine 8 [select]:
launchpad.net/juju-core/utils/parallel.(*Try).loop(0xc210051cb0, 0x0, 0x0, 0x0, 0x35)
 /home/jameinel/dev/go/src/launchpad.net/juju-core/utils/parallel/try.go:83 +0x30f
launchpad.net/juju-core/utils/parallel.func·004()
 /home/jameinel/dev/go/src/launchpad.net/juju-core/utils/parallel/try.go:62 +0x54
created by launchpad.net/juju-core/utils/parallel.NewTry
 /home/jameinel/dev/go/src/launchpad.net/juju-core/utils/parallel/try.go:65 +0x1b3

goroutine 10 [runnable]:
time.Sleep(0x77328fd5)
 /usr/lib/go/src/pkg/runtime/time.goc:31 +0x31
launchpad.net/juju-core/utils.(*Attempt).Next(0xc210134720, 0xe58a70)
 /home/jameinel/dev/go/src/launchpad.net/juju-core/utils/attempt.go:51 +0x122
launchpad.net/juju-core/state/api.func·002(0xc2101346c0, 0x0, 0x0, 0x0, 0x0)
 /home/jameinel/dev/go/src/launchpad.net/juju-core/state/api/apiclient.go:192 +0x58
launchpad.net/juju-core/utils/parallel.func·005()
 /home/jameinel/dev/go/src/launchpad.net/juju-core/utils/parallel/try.go:135 +0x41
created by launchpad.net/juju-core/utils/parallel.(*Try).loop
 /home/jameinel/dev/go/src/launchpad.net/juju-core/utils/parallel/try.go:86 +0x9f