CommitController: Notify observers when adding files

We forgot to do this when changing the code in 963969af78
(CommitController: don't mutate array we enumerate when refreshing index).
This meant that some changes in the index would not be shown when refreshing,
for example newly added or changed files.

PBGitCommitController.m

@@ -264,6 +264,10 @@
 	}
 
 	// Do new files
+	if (![[dictionary allKeys] count])
+		return;
+
+	[self willChangeValueForKey:@"files"];
 	for (NSString *path in [dictionary allKeys]) {
 		NSArray *fileStatus = [dictionary objectForKey:path];
 
@@ -285,6 +289,7 @@
 
 		[files addObject: file];
 	}
+	[self didChangeValueForKey:@"files"];
 }
 
 - (void) readUnstagedFiles:(NSNotification *)notification