fixes for zulip plugin

[drewp]

Description:

Without looking into it much, I found that talking to zulip (self-hosted, zulip/docker-zulip:9.4-0) fails without a 'topic' key and succeeds with one.

Failure looks like this. Notice how the response body is critical for debugging, so I promoted it to warning:

[main] 2025-05-10 21:30:30,245 [WARNING] apprise: Zulip Payload: {'title': 'topic1', 'content': 'line1', 'type': 'stream', 'to': 'alerts'}
[main] 2025-05-10 21:30:30,292 [WARNING] apprise: Failed to send Zulip notification to alerts: Bad Request - Unsupported Parameters., error=400.
[main] 2025-05-10 21:30:30,292 [WARNING] apprise: Response Details:
[main] b'{"result":"error","msg":"Missing topic","code":"BAD_REQUEST"}\n'

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• No lint errors (use flake8)
• 100% test coverage

Testing

bin/test.sh didn't work for me, but grep topic test/test_plugin_zulip.py returns nothing :) so CI will probably pass.

[drewp]

https://github.com/caronc/apprise/wiki/Notify_zulip should also be updated to say 'title' will be used as the topic, and it must be a nonempty string.

[caronc]

Zulip supports both topic and subject depending on the message type. I think the true fix for this is to allow a ?mode= from the command line (argument) that allows you to control what the payload looks like (and toggle between all of the accepted kinds

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.37%. Comparing base (ae7f8b8) to head (a14b88d).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1330   +/-   ##
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  Coverage   99.37%   99.37%           
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  Files         161      161           
  Lines       21069    21069           
  Branches     3791     3791           
=======================================
  Hits        20938    20938           
  Misses        121      121           
  Partials       10       10           

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