Update VisualizationDemo.json

Changing view condition for the grid that relies on selecting a resource

Workbooks/VisualizationDemo.json

@@ -390,6 +390,10 @@
               "resourceType": "microsoft.operationalinsights/workspaces"
             },
             "customWidth": "75",
+            "conditionalVisibility": {
+              "parameterName": "Resource",
+              "comparison": "isNotEqualTo"
+            },
             "name": "query - 6"
           }
         ]