loader: invalidate the import cachefor extra modules #221
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Because we are mangling with importlib, we can find from time to
time an invalidation issue with sys.path_importer_cache, that
requires the removal of FileFinder that remain None for the
extra_module_dirs
(cherry picked from commit 0fb8e707a45d5caf40759e8b4943590d6fce5046)