store search - bug fix and enhancement

Improvement to some error handling.
Fixed a bug in the results display callback.
admin - templating enhancement/bug fix

was prefetching template list in some user interfaces (domains, ebay) to
make template chooser load faster. As the list of templates grows, this
call is getting heavy and not worth the preload.

also fixed a bug in the chooser that caused request there to not
dispatch.
admin - disable prefetch of template list in campaigns too