commit dfac47cb284ffe7e97a99670b890ed8e4c4d4416
Author: Montel Laurent <montel@kde.org>
Date:   Wed Apr 3 15:22:59 2013 +0200

    Fix Bug 317780 - KMail crash trying to Clone or Create new Theme
    
    FIXED-IN: 4.10.3
    BUG: 317780

diff --git a/messagelist/utils/themeeditor.cpp b/messagelist/utils/themeeditor.cpp
index 2d26d28..5671fcd 100644
--- a/messagelist/utils/themeeditor.cpp
+++ b/messagelist/utils/themeeditor.cpp
@@ -411,6 +411,8 @@ void ThemePreviewWidget::setTheme( Theme * theme )
   mDropIndicatorPoint2 = QPoint();
   mTheme = theme;
   mDelegate->setTheme( theme );
+  if (!mTheme)
+     return;
   mGroupHeaderSampleItem->setExpanded( true );
 
   const QList< Theme::Column * > & columns = mTheme->columns();
@@ -1547,7 +1549,8 @@ ThemeEditor::~ThemeEditor()
 void ThemeEditor::editTheme( Theme *set )
 {
   mCurrentTheme = set;
-
+  mPreviewWidget->setTheme(mCurrentTheme);
+  
   if ( !mCurrentTheme )
   {
     setEnabled( false );
@@ -1558,8 +1561,6 @@ void ThemeEditor::editTheme( Theme *set )
   nameEdit()->setText( set->name() );
   descriptionEdit()->setPlainText( set->description() );
 
-  mPreviewWidget->setTheme( set );
-
   ComboBoxUtils::setIntegerOptionComboValue( mViewHeaderPolicyCombo, (int)mCurrentTheme->viewHeaderPolicy() );
 
   mIconSizeSpinBox->setValue( set->iconSize() );