Have "finAndRevealPath()" fail on no file
Have "finAndRevealPath()" fail on no file

If a file does not exist for the current buffer, this function
should fail with a clear warning message.

Here, I improved the messages that this function prints so that it
fails gracefully when no path can be determined in the calling
context.

tschundler/dotfiles,tschundler/dotfiles,tschundler/dotfiles