Default status to 0 if undefined

This keeps the status-changed event from triggering
the first time the status is requested as it goes
from undefined to 0 which should be treated as no
change.

src/app/git.coffee

@@ -70,8 +70,8 @@ class Git
     @getRepo().getHead() ? ''
 
   getPathStatus: (path) ->
-    currentPathStatus = @statuses[path]
-    pathStatus = @getRepo().getStatus(@relativize(path))
+    currentPathStatus = @statuses[path] ? 0
+    pathStatus = @getRepo().getStatus(@relativize(path)) ? 0
     if pathStatus > 0
       @statuses[path] = pathStatus
     else