FIX: Be sure matplotlib.backends is imported before we use it #18026
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PR Summary
If the user specifies the backend via
'module://XZY'
there in noguarantee that they have imported
matplotilb.backends
(which isan empty
__init__.py
) as part of their module which results in anAttributeError when we monkeypatch the backend name into it.
closes #18022
PR Checklist