[MERGE] Fix for 306394: warning, not error, on non-existent file.

[Stephen J. Turnbull]

Karl Fogel writes:

 > Because it's one of the 4 blockers keeping the GNU Emacs project from
 > switching to bzr (look for bugs tagged with "emacs-adoption" to see them
 > all).  Specifically, the line in the bug description about:
 > 
 >    "This type of operation occurs in normal usage in emacs when using
 >     the vc-dir GUI."

Adoption blocker?!  You've got to be kidding.  Trap the error, lather,
rinse, repeat, move on.  Get the TRAMP people to help, this is the
kind of thing that is their meat and potatoes.  If this is a blocker,
Emacs is dead.  Long live Emacs!

 > Independently of Emacs, I think warning is a better behavior here than
 > erroring.  The user has asked for status on a number of path names.  For
 > some of those names, the status is "does not exist".

Now, that's a convincing argument!  To me, anyway ....