Merge ~xavpaice/charm-telegraf:fix_functests into charm-telegraf:master

[Xav Paice]

for functests, allow for ubuntu charm to have no status message

[🤖 prod-jenkaas-bootstack (prod-jenkaas-bootstack)]

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[🤖 Canonical IS Merge Bot (canonical-is-mergebot)]

This merge proposal is being monitored by mergebot. Change the status to Approved to merge.

[🤖 prod-jenkaas-bootstack (prod-jenkaas-bootstack)]

PASSED: Continuous integration, rev:54b2a0116dd64241680a3468ecadac697384b189
https://jenkins.canonical.com/bootstack/job/lp-charm-telegraf-ci/37/
Executed test runs:
    SUCCESS: https://jenkins.canonical.com/bootstack/job/lp-charm-test-unit-withcompiler/117/
    None: https://jenkins.canonical.com/bootstack/job/lp-update-mp/328/

Click here to trigger a rebuild:
https://jenkins.canonical.com/bootstack/job/lp-charm-telegraf-ci/37//rebuild

review: Approve (continuous-integration)

[Paul Goins (vultaire)]

Familiar w/ this, LGTM.

review: Approve

[🤖 Canonical IS Merge Bot (canonical-is-mergebot)]

Change successfully merged at revision febea50a567055571d877807aa7f149d7a402828

diff --git a/src/tests/functional/tests/tests.yaml b/src/tests/functional/tests/tests.yaml
index 7603b36..f024fe7 100644
--- a/src/tests/functional/tests/tests.yaml
+++ b/src/tests/functional/tests/tests.yaml
@@ -27,6 +27,8 @@ target_deploy_status:
   nova-compute:
     workload-status: blocked
     workload-status-message: "Missing relations: image"
+  ubuntu:
+    workload-status-message: ""
 tests:
   - base:
       - tests.test_telegraf.TestTelegraf