Commit 1f2011ece removed a `try-catch` around triggering the `remove` handlers
in the `jQuery.cleanData` override. The `try-catch` was meant for old IE but it was
also catching an error coming from the tooltip `remove` handler depending on
being able to find a relevant tooltip. The `_find` method returns `null`, though,
when the tooltip cotent is empty.
Instead of restoring the `try-catch`, handle the `null` case in the `remove` handler.
Fixes gh-1990
Closes gh-1994
Co-authored-by: Claas Augner <github@caugner.de>
Co-authored-by: Michał Gołębiowski-Owczarek <m.goleb@gmail.com>
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