[MERGE][BUG #77657] Give a nicer error for non fs_enc() paths

[John Arbash Meinel]

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Bug #77657 is about our inability to add paths that cannot be decoded in
the current FS encoding.

The attached patch just changes "iter_changes" to give a clear exception
about what file is causing the problems (which also removes the ugly
traceback.)

So I won't claim that it fixes the bug, as I'm not really sure what to
do about adding a file we can't represent in Unicode.

But at a minimum it shows what file needs to be renamed so that the user
can get back to working.

John
=:->
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