cli: Cleanly skip broken symlinks that are ignored #654
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Before this commit, yamllint would output "[Errno 2] No such file or directory" when running on a directory which contained a broken symbolic link, even if the file is set to be ignored in yamllint configuration.
This commit fixes that, and adds corresponding tests.
As a side effect this changes
yamllint.linter.run(stream, config)
, so tools that would use this API need to filter ignored files beforehand.Fixes #399