Always show Tape's window on Mac OS when the app starts, even when is empty.

--HG--
branch : develop

src/app/tape/mapplication.cpp

@@ -420,8 +420,6 @@ bool MApplication::event(QEvent *e)
         case QEvent::ApplicationActivate:
         {
             Clean();
-            if (!mainWindows.isEmpty())
-            {
             TMainWindow *mw = MainWindow();
             if (mw && not mw->isMinimized())
             {
@@ -429,8 +427,6 @@ bool MApplication::event(QEvent *e)
             }
             return true;
         }
-            break;
-        }
 #endif //defined(Q_OS_MAC)
         default:
             return VAbstractApplication::event(e);