Crash in svn_client_ls()

Hi,

Going through all crashreports I received for TortoiseSVN the last week,
I found the following which is something for you guys:

when calling svn_client_ls() with path_or_url param as an empty string
(I know, that's a bug in TSVN) then a crash occurs. Since it's wrong to
pass an empty path to that function it's not that important, but still,
I think Subversion shouldn't crash but return an error.

the stacktrace (linenumbers are valid for the 1.1.3 release):
subversion\libsvn_client\ls.c : line 98
subversion\libsvn_ra_dav\props.c : line 1134
subversion\libsvn_ra_dav\props.c : line 893
subversion\libsvn_ra_dav\props.c : line 765
subversion\libsvn_ra_dav\props.c : line 648
subversion\libsvn_subr\svn_string.c : line 235

the crash occurs because the cstring param in svn_stringbuf_create is NULL.

Stefan

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