wrappers: fixed locks for empty collection

it caused "Locks" checkbox to be checked, and it picked up first lock
from selectbox as default.

Change-Id: I13fdf104c6c32b783fb539f8947e3e071cb9788c
Signed-off-by: Lukas Bednar <lbednar@redhat.com>
Extend trigger_builds functionality

To support fan-out and conditional trigger behaviour with
Jenkins Parameterized Trigger Plugin add following attributes:

* Config for failTriggerOnMissing
* Parameter factories

Change-Id: I3755ed32779e64e7aee7a55a00c683edff6bbbd8
Merge "Extend trigger_builds functionality"