Update theme CSS.
Fix issue with custom fields on ticket listing.
Only filter custom fields if there are values to filter.
Fixed issue with ticket filter `JOIN` query.
Update framework.
Only select ticket columns.
Update framework.
Merge remote-tracking branch 'origin/3.4'

* origin/3.4:
  Only select ticket columns.
  Update framework.
  Fixed issue with ticket filter `JOIN` query.
  Only filter custom fields if there are values to filter.
  Fix issue with custom fields on ticket listing.