Fix NPE for non-vis embeddables on dashboards (#682)

Signed-off-by: Ashish Agrawal <ashisagr@amazon.com>
(cherry picked from commit 8fcf14c)
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

public/actions/alerting_dashboard_action.tsx

@@ -51,12 +51,13 @@ export const createAlertingAction = ({
     getIconType: () => icon,
     type,
     grouping,
-    // Do not show actions for certin visualizations
+    // Do not show actions for certain visualizations
     isCompatible: async ({ embeddable }: ActionContext) => {
       return Boolean(
         embeddable.parent &&
         embeddable.getInput()?.viewMode === 'view' &&
         isDashboard(embeddable.parent) &&
+        embeddable.vis &&
         isEligibleForVisLayers(embeddable.vis, getUISettings())
       );
     },