Catch StopIteration error and alert user and exit failure. #5553
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Fixes #5462
The issue
Sometimes users have index names defined in their Pipfile that do not correspond to actually defined sources.
The fix
Alert the user when this happens with a human friendly message and exit with failure code.
The checklist
news/
directory to describe this fix with the extension.bugfix.rst
,.feature.rst
,.behavior.rst
,.doc.rst
..vendor.rst
. or.trivial.rst
(this will appear in the release changelog). Use semantic line breaks and name the file after the issue number or the PR #.