This isn't a problem in a normal setup, but if a command was unregistered, it could cause the dialog to crash.
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Event Timeline
Change 456751 had a related patch set uploaded (by Esanders; owner: Esanders):
[mediawiki/extensions/VisualEditor@master] Don't assume commandGroup has a demote property set
Change 456749 had a related patch set uploaded (by Esanders; owner: Esanders):
[VisualEditor/VisualEditor@master] Cleanup: Don't assume commands exist when building list
Change 456751 merged by jenkins-bot:
[mediawiki/extensions/VisualEditor@master] Don't assume commandGroup has a demote property set
Change 456749 merged by jenkins-bot:
[VisualEditor/VisualEditor@master] Cleanup: Don't assume commands exist when building list
Change 457898 had a related patch set uploaded (by Bartosz Dziewoński; owner: Bartosz Dziewoński):
[mediawiki/extensions/VisualEditor@master] Update VE core submodule to master (a72861b26)
Change 457898 merged by jenkins-bot:
[mediawiki/extensions/VisualEditor@master] Update VE core submodule to master (a72861b26)