add marker in feed to show where they've seen claims, plus other small clean-up

src/views/ProjectsView.vue

@@ -167,7 +167,10 @@ export default class ProjectsView extends Vue {
     } else {
       const accounts = await accountsDB.accounts.toArray();
       const account = R.find((acc) => acc.did === activeDid, accounts);
-      const identity = JSON.parse(account?.identity || "undefined");
+      const identity = JSON.parse(account?.identity || "null");
+      if (!identity) {
+        throw new Error("No identity found.");
+      }
       this.LoadProjects(identity);
     }
   }