Fix/Allow to copy news article into a topic

[Tschuppi81]

Please fill in the commit message below and work through the checklist. You can delete parts that are not needed, e.g. the optional description, the link to a ticket or irrelevant options of the checklist.

Commit message

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TYPE: <Feature|Performance|Bugfix>
LINK:
HINT:

Checklist

• I have performed a self-review of my code
• I considered adding a reviewer
• I have added an upgrade hint such as data migration commands to be run
• I have updated the PO files
• I have added new modules to the docs
• I made changes/features for both org and town6
• I have updated the election_day API docs
• I have tested my code thoroughly by hand
  • I have tested styling changes/features on different browsers
  • I have tested javascript changes/features on different browsers
  • I have tested database upgrades
  • I have tested sending mails
  • I have tested building the documentation
• I have added tests for my changes/features
  • I am using freezegun for tests depending on date and times
  • I considered using browser tests für javascript changes/features
  • I have added/updated jest tests for d3rendering (election_day, swissvotes)

[linear]

OGC-2105 Sentry: AttributeError'News' object has no attribute 'sidepanel_links'

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.24%. Comparing base (1ddb434) to head (1cbf848).

Additional details and impacted files

Files with missing lines	Coverage Δ
src/onegov/org/models/extensions.py	89.74% <100.00%> (+0.04%)	⬆️

... and 184 files with indirect coverage changes

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[Tschuppi81]

As the test fails I am unsure if my fix broke something. Can you, @cyrillkuettel, comment on it please?

[Tschuppi81]

@cyrillkuettel The implemented behavior shall not be possible, see comment in ticket. I will rework it to display an info/error instead.