False positive: signal_messenger notification groups

[dlitz]

Watchman version: 0.6.5

In configuration.yaml, I have the Signal Messenger integration configured like this:

notify:
  - name: signal_foo
    platform: signal_messenger
    url: "http://signal-cli-rest-api.example.com:8080"
    number: "+16045551234"
    recipients:
      - "group.KzJQeU5YU3Vldkd4ak92WHk5NHFrbVJZVHo0cVNVRkpCVXJKS1RwbzNLeD0="

This is showing up as a false positive in Watchman:

- id: group.KzJQeU5YU3Vldkd4ak92WHk5NHFrbVJZVHo0cVNVRkpCVXJKS1RwbzNLeD0
  state: missing
  friendly_name: ''
  occurrences: configuration.yaml:55

The problem is that Watchman falsely interprets the Signal group as a HA entity name.