tqdesigner: prevent SEGV from invalid pointer. This resolves issue #97.

Signed-off-by: Michele Calgaro <michele.calgaro@yahoo.it>
Signed-off-by: ormorph <roma251078@mail.ru>
(cherry picked from commit 6e5c7efaca)

tools/designer/designer/resource.cpp

@@ -1247,7 +1247,10 @@ void Resource::saveItems( TQObject *obj, TQTextStream &ts, int indent )
 	    indent--;
 	    ts << makeIndent( indent ) << "</column>" << endl;
 	}
-	saveItem( lv->firstChild(), ts, indent - 1 );
+	if (lv->firstChild())
+	{
+	    saveItem( lv->firstChild(), ts, indent - 1 );
+	}
     }
 #if !defined (TQT_NO_TABLE)
     else if ( ::tqt_cast<TQTable*>(obj) ) {
@@ -1307,6 +1310,11 @@ void Resource::saveItems( TQObject *obj, TQTextStream &ts, int indent )
 
 void Resource::saveItem( TQListViewItem *i, TQTextStream &ts, int indent )
 {
+    if (!i)
+    {
+	return;
+    }
+
     TQListView *lv = i->listView();
     while ( i ) {
 	ts << makeIndent( indent ) << "<item>" << endl;