svn_wc_text_modified_p was assuming that just because we could construct a string variable that might point to the text-base version of the file, that the actual file exists.
svn_wc_text_modified_p was assuming that just because we could
construct a string variable that might point to the text-base version of
the file, that the actual file exists.

* questions.c:  (svn_wc_text_modified_p): Check for existance of text-base file.

Submitted by: Bill Tutt
Reviewed by: Karl Fogel

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion