import-local might need gpg key for <email address hidden>

I have this in my ~/.gitconfig:
[commit]
    gpgsign = true

I tried locally importing a dsc file, but it blew up because at some point git needed the private gpg key for the importer ID, which I shouldn't (and don't) have:
$ git ubuntu import-local artful ~/x/libpam-ccreds_10-6build1.dsc
07/20/2017 14:31:45 - INFO:Using git repository at /tmp/tmpshx0pg2c

You need a passphrase to unlock the secret key for
user: "Andreas Hasenack <email address hidden>"
1024-bit DSA key, ID F3DDC290, created 2000-03-28

You need a passphrase to unlock the secret key for
user: "Andreas Hasenack <email address hidden>"
1024-bit DSA key, ID F3DDC290, created 2000-03-28

You need a passphrase to unlock the secret key for
user: "Andreas Hasenack <email address hidden>"
1024-bit DSA key, ID F3DDC290, created 2000-03-28

You need a passphrase to unlock the secret key for
user: "Andreas Hasenack <email address hidden>"
1024-bit DSA key, ID F3DDC290, created 2000-03-28

You need a passphrase to unlock the secret key for
user: "Andreas Hasenack <email address hidden>"
1024-bit DSA key, ID F3DDC290, created 2000-03-28

You need a passphrase to unlock the secret key for
user: "Andreas Hasenack <email address hidden>"
1024-bit DSA key, ID F3DDC290, created 2000-03-28

You need a passphrase to unlock the secret key for
user: "Andreas Hasenack <email address hidden>"
1024-bit DSA key, ID F3DDC290, created 2000-03-28

You need a passphrase to unlock the secret key for
user: "Andreas Hasenack <email address hidden>"
1024-bit DSA key, ID F3DDC290, created 2000-03-28

07/20/2017 14:31:50 - ERROR:Command exited 1: git commit-tree e1bf2c71f059a61f5f5d15b944d00fdc288b3afd -F /tmp/tmpqh6vnhs5
07/20/2017 14:31:50 - ERROR:stdout:
07/20/2017 14:31:50 - ERROR:stderr: gpg: skipped "usd-importer <email address hidden>": secret key not available
  gpg: signing failed: secret key not available
  error: gpg failed to sign the data
07/20/2017 14:31:50 - ERROR:Unable to commit tree, savedtemp commit message as /tmp/tmpps110vro
Traceback (most recent call last):
  File "/snap/git-ubuntu/95/gitubuntu/git_repository.py", line 945, in commit_tree_hash
    cp = run(commit_tree, env=commit_env)
  File "/snap/git-ubuntu/95/gitubuntu/run.py", line 67, in run
    raise e
  File "/snap/git-ubuntu/95/gitubuntu/run.py", line 52, in run
    stdout=stdout, stderr=stderr, stdin=stdin)
  File "/snap/git-ubuntu/95/usr/lib/python3.5/subprocess.py", line 708, in run
    output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command '['git', 'commit-tree', 'e1bf2c71f059a61f5f5d15b944d00fdc288b3afd', '-F', '/tmp/tmpqh6vnhs5']' returned non-zero exit status 1