Fix: file_exists fails if BibtexBibDir is url #7
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If BibtexBibDir is a url (which it is in my case), then file_exists(...) will report that the file does not exist. However, attempting to open the file directly will work.
We recently tried upgrading from bibtexref2 to bibtexref3, and what originally worked now resulted in a lot of "invalid" entries. With this change we restore the original functionality.