In findfont(fallback_to_default=False), throw if default font is missing #15249
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... instead of entering an infinite loop of findfont -> defaultFont ->
findfont.
A bit of a pain to test (one needs to delete dejavusans both from the
mpl source tree and from the system font folder)...
This should only affect people who delete the default fonts anyways (or
call with fallback_to_default=False), so I'll skip the API change note.
Closes https://gitter.im/matplotlib/matplotlib?at=5d78acdd767de913fcbda27c.
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