Reload the sidebar when removing submodule children. Without this the outline view will sometimes continue to load stale data that has been released and crash.

Author: ksuther

PBGitSidebarController.m

@@ -138,6 +138,8 @@ - (void) observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(
 		[sourceView reloadData];
 	} else if ([kObservingContextSubmodules isEqualToString:(__bridge NSString *)context]) {
 		[submodules.children removeAllObjects];
+		[sourceView reloadData]; //reload now otherwise the outline view may crash while loading old objects
+		
 		NSArray *newSubmodules = [change objectForKey:NSKeyValueChangeNewKey];
 
 		for (PBGitSubmodule *submodule in newSubmodules) {