Bug#835641: diffoscope: traceback when comparing dangling symlink to directory

[Brett Smith]

Here's a patch to prevent the traceback.  It just detects the general
situation (comparing a directory with something else) and bails with a
more helpful message when they're incompatible.

I checked what diff does, and it does something slightly more nuanced:
if you compare directory D against non-directory F, it tries to compare
`/D/$(basename F)` against F.  If that directory+basename path is itself
a directory, then it bails with an error message like the one in this
patch.  Personally I felt like the path translation wasn't especially
helpful, so decided to just bail immediately.

-- 
Brett Smith

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