Add some types

src/app/types/types.module.ts

@@ -96,7 +96,7 @@ export interface StateAPIResult {
   user: User;
   user_state: UserState;
   services: Service[];
-  error: string;
+  error?: string;
 }
 
 

src/app/user.service.ts

@@ -78,16 +78,18 @@ export class UserService {
 
     subscription.map((message: Message) => {
       return message.body;
-    }).subscribe((body: any) => {
-      let json = JSON.parse(body);
-      if (json.message && json.message != '') {
-        this.snackBar.open(json.message);
-        this.messages.push(json.message);
-      }
-      if (json.user_state) {
-        this.updateUserState(json.user_state);
+    }).subscribe(
+      (body: any) => {
+        let json : t.StateAPIResult = JSON.parse(body);
+        if (json.error && json.error != '') {
+          this.snackBar.open(json.error);
+          this.messages.push(json.error);
+        }
+        if (json.user_state) {
+          this.updateUserState(json.user_state);
+        }
       }
-    });
+    );
   }
 
   private updateUser(newUser: t.User) {