Set default label when unselecting all options

[ci skip]

app/assets/javascripts/protected_branch_access_dropdown.js.es6

@@ -9,6 +9,7 @@
       this.$dropdown = $dropdown;
       this.usersPath = '/autocomplete/users.json';
       this.inputCount = 0;
+      this.defaultLabel = this.$dropdown.data('defaultLabel');
 
       $dropdown.glDropdown({
         selectable: true,
@@ -28,7 +29,6 @@
           e.preventDefault();
           self.inputCount++;
           onSelect();
-          return;
         }
       });
     }
@@ -46,9 +46,13 @@
       let types = _.groupBy(currentItems, (item) => { return item.dataset.type; });
       let label = [];
 
+      if (_.isEmpty(types)) {
+        label.push(this.defaultLabel);
+      } else {
         _.allKeys(types).map((type) => {
           label.push(`${types[type].length} ${type}`);
         });
+      }
 
       return label.join(' and ');
     }

app/views/projects/protected_branches/_create_protected_branch.html.haml

@@ -24,14 +24,14 @@
           .col-md-10
             = dropdown_tag('Select',
                            options: { toggle_class: 'js-allowed-to-merge wide js-multiselect', dropdown_class: 'dropdown-menu-user dropdown-menu-selectable', filter: true,
-                           data: { input_id: 'merge_access_levels_attributes' }})
+                           data: { input_id: 'merge_access_levels_attributes', default_label: 'Select' }})
         .form-group
           %label.col-md-2.text-right{ for: 'push_access_levels_attributes' }
             Allowed to push:
           .col-md-10
             = dropdown_tag('Select',
                            options: { toggle_class: 'js-allowed-to-push wide js-multiselect', dropdown_class: 'dropdown-menu-user dropdown-menu-selectable', filter: true,
-                           data: { input_id: 'push_access_levels_attributes' }})
+                           data: { input_id: 'push_access_levels_attributes', default_label: 'Select' }})
 
     .panel-footer
       = f.submit 'Protect', class: 'btn-create btn', disabled: true