Return empty JSON array on empty query

include/ajax.orgs.php

@@ -24,7 +24,10 @@ class OrgsAjaxAPI extends AjaxController {
 
         if(!isset($_REQUEST['q'])) {
             Http::response(400, 'Query argument is required');
-        }
+        } 
+        
+        if (!$_REQUEST['q'])
+            return $this->json_encode(array());
 
         $q = $_REQUEST['q'];
         $limit = isset($_REQUEST['limit']) ? (int) $_REQUEST['limit']:25;

include/ajax.tickets.php

@@ -26,14 +26,17 @@ class TicketsAjaxAPI extends AjaxController {
     function lookup() {
         global $thisstaff;
 
-
         $limit = isset($_REQUEST['limit']) ? (int) $_REQUEST['limit']:25;
         $tickets=array();
+        // Bail out of query is empty
+        if (!$_REQUEST['q'])
+            return $this->json_encode($tickets);
 
         $visibility = Q::any(array(
             'staff_id' => $thisstaff->getId(),
             'team_id__in' => $thisstaff->teams->values_flat('team_id'),
         ));
+
         if (!$thisstaff->showAssignedOnly() && ($depts=$thisstaff->getDepts())) {
             $visibility->add(array('dept_id__in' => $depts));
         }

include/ajax.users.php

@@ -29,6 +29,10 @@ class UsersAjaxAPI extends AjaxController {
             Http::response(400, __('Query argument is required'));
         }
 
+        $matches = array();
+        if (!$_REQUEST['q'])
+            return $this->json_encode($matches);
+
         $q = $_REQUEST['q'];
         $limit = isset($_REQUEST['limit']) ? (int) $_REQUEST['limit']:25;
         $users=array();