From cf0d90f88e1bded84f454a1e8a0379a2836263a6 Mon Sep 17 00:00:00 2001
From: Thomas Hartmann <Thomas.Hartmann@nokia.com>
Date: Mon, 18 Apr 2011 10:26:52 +0200
Subject: [PATCH] QmlDesigner.propertyEditor: crash fix

Setting an empty expression on a value not defined in the model
crashed.

Task-number: QTCREATORBUG-4312
---
 .../qmldesigner/components/propertyeditor/propertyeditor.cpp   | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/plugins/qmldesigner/components/propertyeditor/propertyeditor.cpp b/src/plugins/qmldesigner/components/propertyeditor/propertyeditor.cpp
index eb18766cf45..a6fff788f47 100644
--- a/src/plugins/qmldesigner/components/propertyeditor/propertyeditor.cpp
+++ b/src/plugins/qmldesigner/components/propertyeditor/propertyeditor.cpp
@@ -511,6 +511,9 @@ void PropertyEditor::changeExpression(const QString &name)
             return;
         }
 
+        if (value->expression().isEmpty())
+            return;
+
         if (fxObjectNode.expression(name) != value->expression() || !fxObjectNode.propertyAffectedByCurrentState(name))
             fxObjectNode.setBindingProperty(name, value->expression());