Validate SSID only on the Submit button

- Avoid to validate the SSID when scanning a QR code

Bug: 399791242
Flag: EXEMPT bugfix
Test: Manual testing
  atest SettingsUnitTests:AddNetworkFragmentTest
Change-Id: I91f010f8708490e397d762c96401569fc13601dd

src/com/android/settings/wifi/AddNetworkFragment.java

@@ -206,6 +206,9 @@ public class AddNetworkFragment extends InstrumentedFragment implements WifiConf
 
     @VisibleForTesting
     void handleSubmitAction() {
+        if (!mUIController.canFinish()) {
+            return;
+        }
         successfullyFinish(mUIController.getConfig());
     }
 
@@ -234,9 +237,6 @@ public class AddNetworkFragment extends InstrumentedFragment implements WifiConf
 
             activity.getSystemService(WifiManager.class).save(config, saveListener);
         } else {
-            if (!mUIController.canFinish()) {
-                return;
-            }
             Intent intent = new Intent();
             intent.putExtra(WIFI_CONFIG_KEY, config);
             activity.setResult(Activity.RESULT_OK, intent);