Disabled add issues button if no lists exist

app/assets/javascripts/boards/boards_bundle.js.es6

@@ -88,12 +88,25 @@ $(() => {
     }
   });
 
-  // This element is outside the Vue app
-  $(document)
-    .off('click', '.js-show-add-issues')
-    .on('click', '.js-show-add-issues', (e) => {
-      e.preventDefault();
-
-      ModalStore.store.showAddIssuesModal = true;
-    });
+  gl.IssueBoardsModalAddBtn = new Vue({
+    el: '#js-add-issues-btn',
+    data: {
+      modal: ModalStore.store,
+      store: Store.state,
+    },
+    computed: {
+      disabled() {
+        return Store.shouldAddBlankState();
+      },
+    },
+    template: `
+      <button
+        class="btn btn-create pull-right prepend-left-10 has-tooltip"
+        type="button"
+        :disabled="disabled"
+        @click="modal.showAddIssuesModal = true">
+        Add issues
+      </button>
+    `,
+  });
 });

app/controllers/projects/boards/issues_controller.rb

@@ -7,7 +7,7 @@ module Projects
 
       def index
         issues = ::Boards::Issues::ListService.new(project, current_user, filter_params).execute
-        issues = issues.page(params[:page])
+        issues = issues.page(params[:page]).per(params[:per] || 20)
 
         render json: {
           issues: serialize_as_json(issues),

app/views/shared/issuable/_filter.html.haml

@@ -38,8 +38,7 @@
             #js-boards-search.issue-boards-search
               %input.pull-left.form-control{ type: "search", placeholder: "Filter by name...", "v-model" => "filters.search", "debounce" => "250" }
               - if can?(current_user, :admin_list, @project)
-                %button.btn.btn-create.pull-right.prepend-left-10.js-show-add-issues{ type: "button" }
-                  Add issues
+                #js-add-issues-btn.pull-right.prepend-left-10
                 .dropdown.pull-right
                   %button.btn.btn-create.btn-inverted.js-new-board-list{ type: "button", data: { toggle: "dropdown", labels: labels_filter_path, namespace_path: @project.try(:namespace).try(:path), project_path: @project.try(:path) } }
                     Add list