Fix entries of user table are visible if database has no tags

cps/static/js/table.js

@@ -661,7 +661,7 @@ function move_header_elements() {
         }
     });
     $(".multi_selector").selectpicker();
-
+    if ($(".multi_head").length) {
         if (!$._data($(".multi_head").get(0), "events")) {
             // Functions have to be here, otherwise the callbacks are not fired if visible columns are changed
             $(".multi_head").on("click", function () {
@@ -689,6 +689,7 @@ function move_header_elements() {
                 );
             });
         }
+    }
 
     $("#user_delete_selection").click(function () {
         $("#user-table").bootstrapTable("uncheckAll");
@@ -699,7 +700,7 @@ function move_header_elements() {
     $("#select_default_language").on("change", function () {
         selectHeader(this, "default_language");
     });
-
+    if ($(".check_head").length) {
         if (!$._data($(".check_head").get(0), "events")) {
             $(".check_head").on("change", function () {
                 var val = $(this).data("set");
@@ -708,6 +709,8 @@ function move_header_elements() {
                 checkboxHeader(val, name, data);
             });
         }
+    }
+    if ($(".button_head").length) {
         if (!$._data($(".button_head").get(0), "events")) {
             $(".button_head").on("click", function () {
                 var result = $('#user-table').bootstrapTable('getSelections').map(a => a.id);
@@ -733,6 +736,7 @@ function move_header_elements() {
             });
         }
     }
+}
 
 function handleListServerResponse (data) {
     $("#flash_success").remove();