Fix crash when url is empty

TODO need to merge in akonadi-port

svn path=/trunk/KDE/kdepim/; revision=1074787

archivefolderdialog.cpp

@@ -94,6 +94,7 @@ ArchiveFolderDialog::ArchiveFolderDialog( QWidget *parent )
   mUrlRequester->setMode( KFile::LocalOnly | KFile::File );
   mUrlRequester->setFilter( "*.tar *.zip *.tar.gz *.tar.bz2" );
   fileNameLabel->setBuddy( mUrlRequester );
+  connect( mUrlRequester->lineEdit(), SIGNAL(textChanged(const QString &)), SLOT( slotUrlChanged(const QString&)));
   connect( mUrlRequester, SIGNAL(urlSelected(const KUrl&)),
            this, SLOT(slotFixFileExtension()) );
   mainLayout->addWidget( mUrlRequester, row, 1 );
@@ -115,6 +116,11 @@ ArchiveFolderDialog::ArchiveFolderDialog( QWidget *parent )
   resize( 500, minimumSize().height() );
 }
 
+void ArchiveFolderDialog::slotUrlChanged( const QString & text)
+{
+  enableButtonOk( !text.isEmpty() );
+}
+
 void ArchiveFolderDialog::slotFolderChanged( KMFolder *folder )
 {
   mDeleteCheckBox->setEnabled( folder->canDeleteMessages() );

archivefolderdialog.h

@@ -43,6 +43,7 @@ class ArchiveFolderDialog : public KDialog
 
     void slotFixFileExtension();
     void slotFolderChanged( KMFolder * );
+    void slotUrlChanged( const QString& );
     /** reimp */
     virtual void slotButtonClicked( int button );