[PATCH]: Use more informative error message when trying to switch to a target path that doesn't exist

While confusing users is always fun, saying "Cannot replace directory
from within" when someone attempts and svn switch to a directory path
that doesn't exist is not very helpful.

The attached special cases the error for when the target entry is
non-existent, so that it says "Target path does not exist" instead.

[[[

   Use more informative error when trying to deal with a target path
   that doesn't exist.

   * subversion/libsvn_repos/reporter.c
     (drive): Check !t_entry first and give more useful message
     when it is NULL.
]]]

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