Fix rendering assignee changed comments without assignee (#27927) #27952
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Backport #27927 by @invliD
When an assignee changed event comment is rendered, most of it is guarded behind the assignee ID not being 0. However, if it is 0, that results in quite broken rendering for that comment and the next one. This can happen, for example, when repository data imported from outside of Gitea is incomplete.
This PR makes sure comments with an assignee ID of 0 are not rendered at all.
Screenshot before:

The comments in this screenshot are:
Comments 2 and 3 are rendered without any text, which indents the next comment and does not leave enough vertical space.