catch exception

git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@25722 72102866-910b-0410-8b05-ffd578937521

Source/NSUserDefaults.m

@@ -1456,7 +1456,17 @@ static BOOL isLocked = NO;
 
 - (void) unlockDefaultsFile
 {
-  [_fileLock unlock];
+  NS_DURING
+    {
+      [_fileLock unlock];
+    }
+  NS_HANDLER
+    {
+      NSLog(@"Warning ... someone broke our lock (%@) ... and may have"
+        @" interfered with updating defaults data in file.", 
+        [_defaultsDatabase stringByAppendingPathExtension: @"lck"]);
+    }
+  NS_ENDHANDLER
   isLocked = NO;
 }