Subversion client errors silently drop svn metadata

[Matt Giuca]

If a Subversion client error occurs in a directory listing, rather than raising an exception, it will simply return a directory listing containing no SVN metadata.

For the end user, this manifests itself as:
a) The file listing will simply display the directory as if it was not a working directory. (i.e., there will be no ticks next to files), and Subversion commands are inaccessible.
b) The special home will report the directory as "blocked" rather than a valid checkout. This is because it will ask for a dir listing of the directory and check whether it has SVN metadata; since it doesn't, it assumes it is some other directory you put there.

This occurs because there is no checking done of the ClientError returned by PySvn.

[Matt Giuca (mgiuca)]

Fixed in trunk r1627.