Do not set badge identifier for a given path URL if the URL is nil

Signed-off-by: Claudio Cambra <claudio.cambra@nextcloud.com>

shell_integration/MacOSX/NextcloudIntegration/FinderSyncExt/FinderSync.m

@@ -196,8 +196,12 @@
 
 - (void)setResult:(NSString *)result forPath:(NSString*)path
 {
-	NSString *normalizedPath = [path decomposedStringWithCanonicalMapping];
-	[[FIFinderSyncController defaultController] setBadgeIdentifier:result forURL:[NSURL fileURLWithPath:normalizedPath]];
+    NSString *const normalizedPath = path.decomposedStringWithCanonicalMapping;
+    NSURL *const urlForPath = [NSURL fileURLWithPath:normalizedPath];
+    if (urlForPath == nil) {
+        return;
+    }
+    [FIFinderSyncController.defaultController setBadgeIdentifier:result forURL:urlForPath];
 }
 
 - (void)reFetchFileNameCacheForPath:(NSString*)path