Bug 19389: Hide library groups pull down if empty

Regression introduced by bug
  commit 141200794d
    Bug 15295: Koha::Libraries - Remove GetBranchCategories

The intranet advanced search page offers to search for groups of
libraries, even if the pull down is empty as no library groups have
been defined.

Test plan:
- Go to the adv search page at the intranet
- Without library group you must not see the "Groups of libraries"
dropdown list
- With at least a library group you must see it

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>

koha-tmpl/intranet-tmpl/prog/en/modules/catalogue/advsearch.tt

@@ -242,7 +242,7 @@
         [% PROCESS options_for_libraries prefix => "branch:" libraries => Branches.all( selected => selected_branchcode, unfiltered => 1 ) %]
         </select></p>
     <!-- <input type="hidden" name="limit" value="branch: MAIN" /> -->
-        [% IF ( searchdomainloop ) %]
+        [% IF searchdomainloop.count %]
     <p>OR</p> <!-- should addjs to grey out group pulldown if a library is selected. -->
         <p><label for="categoryloop">Groups of libraries: </label><select name="multibranchlimit" id="categoryloop">
         <option value=""> -- none -- </option>