Small improvement

app/src/main/java/eu/faircode/email/ActivitySetup.java

@@ -1010,7 +1010,7 @@ public class ActivitySetup extends ActivityBase implements FragmentManager.OnBac
                     ToastEx.makeText(ActivitySetup.this, R.string.title_setup_password_invalid, Toast.LENGTH_LONG).show();
                 else if (ex instanceof IOException && ex.getCause() instanceof IllegalBlockSizeException)
                     ToastEx.makeText(ActivitySetup.this, R.string.title_setup_import_invalid, Toast.LENGTH_LONG).show();
-                else if (ex instanceof IllegalArgumentException)
+                else if (ex instanceof IllegalArgumentException || ex instanceof JSONException)
                     ToastEx.makeText(ActivitySetup.this, ex.getMessage(), Toast.LENGTH_LONG).show();
                 else
                     Log.unexpectedError(getSupportFragmentManager(), ex);