Ignore empty .repos files in recursive VCS import #22
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If an upstream repo specified in .repos contains itself an empty .repos file,
vcs import
fails, making it impossible to clone the repo.Example: Running
vcs import
on https://github.com/tier4/ars408_driver/tree/main results in the errorInput data is not valid format: 'NoneType' object is not subscriptable
.While technically an empty .repos file is invalid, those cases can easily ignored for the ease-of-use.