[issue25313] IDLE: gracefully handle themes (or keysets, or ...) not present

[Roundup Robot]

Roundup Robot added the comment:

New changeset b95c10cb457d by Terry Jan Reedy in branch '2.7':
Issue #25313: Change the handling of new built-in text color themes to better
https://hg.python.org/cpython/rev/b95c10cb457d

New changeset 6185c5603eed by Terry Jan Reedy in branch '3.4':
Issue #25313: Change the handling of new built-in text color themes to better
https://hg.python.org/cpython/rev/6185c5603eed

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nosy: +python-dev

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