Bug 17808: Fix behavior when editing a circ rule

Bug 17808: Fix behavior when editing a circ rule

The original behavior is broken, see https://stackoverflow.com/questions/21410484/jquery-selector-to-find-out-count-of-non-empty-inputs

Test plan:
Edit a circ rule
=> Without this patch you get a useless message
=> With this patch, no message
Edit a circ rule with content in inputs
=> With or without this patch you get a useful message

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
(cherry picked from commit 5a9ffa92cecf69ec44450da9676cfbdb0f7d9fa1)
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>