Changed button code to be transparent when there's no text.

autotests/kjsfunctionstest.cpp

@@ -1,5 +1,5 @@
 /***************************************************************************
- *   Copyright (C) 2018 by Intevation GmbH <intevation@intevation.de>      *
+ *   Copyright (C) 2019 by João Netto <joaonetto901@gmail.com>             *
  *                                                                         *
  *   This program is free software; you can redistribute it and/or modify  *
  *   it under the terms of the GNU General Public License as published by  *

ui/formwidgets.cpp

@@ -385,6 +385,12 @@ PushButtonEdit::PushButtonEdit( Okular::FormFieldButton * button, QWidget * pare
     : QPushButton( parent ), FormWidgetIface( this, button )
 {
     setText( button->caption() );
+    
+    if( button->caption().isEmpty() )
+    {
+        setFlat( true );
+    }
+    
     setVisible( button->isVisible() );
     setCursor( Qt::ArrowCursor );
 }