Handle errored logins

app/src/main/java/app/insti/activity/LoginActivity.java

@@ -94,6 +94,7 @@ public class LoginActivity extends AppCompatActivity {
             Uri query = Uri.parse(data);
             authCode = query.getQueryParameter("code");
 
+            if (authCode != null) {
                 /* Show progress dialog */
                 progressDialog.setMessage("Logging In");
                 progressDialog.setCancelable(false);
@@ -101,9 +102,11 @@ public class LoginActivity extends AppCompatActivity {
                 if (!progressDialog.isShowing()) {
                     progressDialog.show();
                 }
-
                 /* Perform the login */
                 login(authCode, redirectUri);
+            } else {
+                Toast.makeText(this, "Login Failed!", Toast.LENGTH_SHORT).show();
+            }
         }
 
         // Setup web view placeholder