Don't load JavaScript extensions on the 404 page.
Don't load JavaScript extensions on the 404 page.

The 404 page was allowing JavaScript extensions to load, but the
initialization code is expecting the page to have a valid URL resolver.
We really don't want to load them here, so disable the block that
handles the loading.

beol/reviewboard,bkochendorfer/reviewboard,sgallagher/reviewboard,reviewboard/reviewboard,chipx86/reviewboard,sgallagher/reviewboard,reviewboard/reviewboard,reviewboard/reviewboard,KnowNo/reviewboard,brennie/reviewboard,custode/reviewboard,beol/reviewboard,1tush/reviewboard,KnowNo/reviewboard,chipx86/reviewboard,brennie/reviewboard,sgallagher/reviewboard,sgallagher/reviewboard,davidt/reviewboard,KnowNo/reviewboard,1tush/reviewboard,davidt/reviewboard,custode/reviewboard,brennie/reviewboard,davidt/reviewboard,bkochendorfer/reviewboard,bkochendorfer/reviewboard,custode/reviewboard,beol/reviewboard,beol/reviewboard,chipx86/reviewboard,custode/reviewboard,brennie/reviewboard,1tush/reviewboard,chipx86/reviewboard,1tush/reviewboard,reviewboard/reviewboard,davidt/reviewboard,1tush/reviewboard,1tush/reviewboard,1tush/reviewboard,1tush/reviewboard,KnowNo/reviewboard,bkochendorfer/reviewboard,1tush/reviewboard