from the issue in bug 705504 comment 48.
Created attachment 602957 [details] [diff] [review] patch. fix blank dialog on bad parms when adding feed from feedUrl (rare case), and add catches to avoid blank dialog on single item error. this needs to go into Tb12 with bug 705504.
Comment on attachment 602957 [details] [diff] [review] patch. [Approval Request Comment] Regression caused by (bug #): 705504 User impact if declined: blank subscribe dialog in certain cases. Testing completed (on c-c, etc.): Risk to taking this patch (and alternatives if risky): very low.
Landed on aurora: http://hg.mozilla.org/releases/comm-aurora/rev/8deff9ff0b89