Merged in ValentinaZhuravska/valentina/feature (pull request #136)

Fixed issue #537. Valentina crashes when use undo command.

--HG--
branch : release

ChangeLog.txt

@@ -14,6 +14,7 @@
 - Fixed Bisector tool bug. The tool created internal variable for wrong segment.  
 - [#526] Dialog Detail is not on top after selection second object on Mac.
 - [#532] Unexpected error occurs when zoom out image.
+- [#537] Valentina crashes when use undo command.
 
 # Version 0.4.4 April 12, 2016
 - Updated measurement templates with all measurements. Added new template Aldrich/Women measurements.

src/app/valentina/mainwindow.cpp

@@ -2261,6 +2261,7 @@ void MainWindow::Clear()
     qt_ntfs_permission_lookup--; // turn it off again
 #endif /*Q_OS_WIN32*/
     qApp->getUndoStack()->clear();
+    toolOptions->ClearPropertyBrowser();
     toolOptions->itemClicked(nullptr);
 }