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getHoverActions(): return null when there are no actions

Administrator requested to merge fix-get-hover-actions into master

Created by: lguychard

Fixes #4940

Emitting an empty array instead of null when no actions are contributed trips up codeintellify's unpinning logic, causing empty hovers to remain pinned.

Test plan:

  • Unit tests verify that null is emitted when appropriate
  • Manually verified that hover overlay was unpinned by running through the scenario described in #4940

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