Always return a response in TI's action_clear view #15980
Merged
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A flask view should always return a response object, not None. This makes
TaskInstanceModelView.action_view
works like all other action views in the same class, redirecting to the previous page even after an exception (and show the exception as a flash).This does not get #15775 resolved, but should make the error more obvious to the user, instead of masking it with another error.
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