Aw4951 Non-fatal error if no viewer defined for itemtype

package.json

@@ -1,6 +1,6 @@
 {
   "name": "farmmaps-lib-app",
-  "version": "3.1.0",
+  "version": "3.2.0",
   "scripts": {
     "ng": "ng",
     "start": "ng serve",

projects/common/src/fm/effects/app-common.effects.ts

@@ -170,7 +170,7 @@ export class AppCommonEffects {
         this.router$.navigate(['/map', query ])
       }else if(viewer == 'edit_in_editor') {
         this.router$.navigate(['/editor', editor, 'item', a.item.code])
-      } else  {
+      } else if(viewer) {
         this.router$.navigate(['/viewer', viewer, 'item', a.item.code])
       }
       return [];