small filedlg fix.

[Rein Klazes]

Hi,

fixes a crash saving messages in Agent 2.0.

Changelog:
	dlls/commdlg	: filedlg.c
	Fix a crash saving a file without file name extension and
	without	extension filter. 

Rein.
-- 
Rein Klazes
rklazes at xs4all.nl
-------------- next part --------------
--- wine/dlls/commdlg/filedlg.c	2004-07-22 09:50:51.000000000 +0200
+++ mywine/dlls/commdlg/filedlg.c	2004-08-15 10:16:23.000000000 +0200
@@ -1960,7 +1960,7 @@
             if (lpstrFilter != (LPWSTR)CB_ERR)  /* control is not empty */
                 filterExt = PathFindExtensionW(lpstrFilter);
 
-            if ( *filterExt ) /* attach the file extension from file type filter*/
+            if ( filterExt && *filterExt ) /* attach the file extension from file type filter*/
                 strcatW(lpstrPathAndFile, filterExt + 1);
             else if ( fodInfos->defext ) /* attach the default file extension*/
                 strcatW(lpstrPathAndFile, fodInfos->defext);