[FIX] web: fix crash keyboard related crash in graph view

Before this fix, when going on the graph view from the dashboard view (
using the fullscreen button on dashboard), the focus is on the search
input, hitting the tab key creates a crash.

This fix gives a default implementation of giveFocus to the
abstractrenderer so there is no crash.

addons/web/static/src/js/views/abstract_renderer.js

@@ -66,6 +66,11 @@ return Widget.extend({
      */
     getLocalState: function () {
     },
+    /**
+     * Order to focus to be given to the content of the current view
+     */
+    giveFocus: function () {
+    },
     /**
      * This is the reverse operation from getLocalState.  With this method, we
      * expect the renderer to restore all DOM state, if it is relevant.

addons/web/static/src/js/views/basic/basic_renderer.js

@@ -135,13 +135,6 @@ var BasicRenderer = AbstractRenderer.extend({
             dom.setSelectionRange(field.getFocusableElement().get(0), {start: offset, end: offset});
         }
     },
-
-    /**
-     * Order to focus to be given to the content of the current view
-     */
-    giveFocus:function() {
-    },
-
     //--------------------------------------------------------------------------
     // Private
     //--------------------------------------------------------------------------

addons/web/static/tests/views/graph_tests.js

@@ -602,6 +602,22 @@ QUnit.module('Views', {
             done();
         });
     });
+
+    QUnit.test('graph view crash when moving from search view using Down key', function (assert) {
+        assert.expect(1);
+
+        var graph = createView({
+            View: GraphView,
+            model: "foo",
+            data: this.data,
+            arch: '<graph string="Partners" type="pie">' +
+                        '<field name="bar"/>' +
+                '</graph>',
+        });
+        graph.renderer.giveFocus();
+        assert.ok(true,"should not generate any error");
+        graph.destroy();
+    });
 });
 
 });