Fix error for unconfigured sources in Geometry Block

lib/js/src/compose/types/page-block/geometry/feed.ts

@@ -7,7 +7,6 @@ interface FeedOptions {
   moduleID: string;
   resource: string;
   titleField: string;
-  geometryField: string;
   displayMarker: boolean;
   displayPolygon: boolean;
 }
@@ -20,7 +19,6 @@ const defOptions = {
   prefilter: '',
   resource: 'compose:record',
   titleField: '',
-  geometryField: '',
   displayMarker: false,
   displayPolygon: true,
 }
@@ -53,4 +51,8 @@ export default class Feed {
       }
     }
   }
+
+  isValid (): boolean {
+    return this.options.moduleID !== NoID && !!this.geometryField
+  }
 }