only use dialog delay for errors

src/main/java/fr/insa/clavardator/ui/MainController.java

@@ -151,14 +151,18 @@ public class MainController implements Initializable {
 		Log.v(this.getClass().getSimpleName(), "Login shown");
 		mainContainer.setVisible(false);
 		loadingController.hide();
-		Timer t = new Timer();
-		t.schedule(new TimerTask() {
-			@Override
-			public void run() {
-				openEditUsernameDialog(isError ? EditUsernameDialogController.Mode.ERROR : EditUsernameDialogController.Mode.INITIAL);
-				t.cancel();
-			}
-		}, 500);
+		if (isError) {
+			Timer t = new Timer();
+			t.schedule(new TimerTask() {
+				@Override
+				public void run() {
+					openEditUsernameDialog(EditUsernameDialogController.Mode.ERROR);
+					t.cancel();
+				}
+			}, 500);
+		} else {
+			openEditUsernameDialog(EditUsernameDialogController.Mode.INITIAL);
+		}
 	}
 
 	private void showError() {