Fix error inside Save layout dialog. Closes #123

ChangeLog.txt

@@ -6,6 +6,7 @@
 - [smart-pattern/valentina#121] Incorrect elliptical arc end angle.
 - [smart-pattern/valentina#122] Extend piece bounding rect.
 - Remember last selected export format.
+- [smart-pattern/valentina#123] Error inside Save layout dialog.
 
 # Version 0.7.46 Mar 31, 2021
 - Fix incorrect calculation of value for multisize measurements in Valentina.

src/app/valentina/dialogs/dialogsavelayout.cpp

@@ -548,7 +548,7 @@ void DialogSaveLayout::PathChanged(const QString &text)
 
     QDir dir(text);
     dir.setPath(text);
-    if (dir.exists(text))
+    if (not text.isEmpty() && dir.exists(text))
     {
         bOk->setEnabled(true);
         palette.setColor(ui->lineEditPath->foregroundRole(), Qt::black);