Allow generator to continue even if any errors encountered in fetch comparison

Petr Korolevrequested to merge
github/fork/carabasdaniel/master into master

Created by: carabasdaniel

This PR fixes issue: https://github.com/github-changelog-generator/github-changelog-generator/issues/665

There might be a more elegant solution to catch only StandardError instead of the general Exception but I think this should ensure that the change log is generated in most cases even through various errors encountered by the fetcher.

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