plugins: avoid crash on broken symlink #2545
Merged
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Description
This changeset adds a check that a plugin file actually exists on disk before it is added to the list of known plugins.
Closes #2269.
Checklist
make qa
(runsmake lint
andmake test
)test_example_roll_4
on 3.8, for which I have filed dice: local test failure on Python 3.8 #2544