Unimplemented providers throw exception when used

Author: puf

library/src/main/java/com/firebase/ui/FirebaseLoginBaseActivity.java

@@ -45,9 +45,8 @@ public void loginWithProvider(SocialProvider provider) {
                 mGoogleAuthHelper.login();
                 break;
             case Facebook:
-                break;
             case Twitter:
-                break;
+                throw new UnsupportedOperationException();
         }
 
         mChosenProvider = provider;
@@ -59,9 +58,8 @@ public void logout() {
                 mGoogleAuthHelper.logout();
                 break;
             case Facebook:
-                break;
             case Twitter:
-                break;
+                throw new UnsupportedOperationException();
         }
         mRef.unauth();
     }