Images being deleted try to preview them selves if single click enabled.

If they do not exists they pop up an error.
Turn off selection during the deletion process to stop this.

bzr-revno: 1746
Fixes: https://launchpad.net/bugs/835033

openlp/plugins/images/lib/mediaitem.py

@@ -99,6 +99,8 @@ class ImageMediaItem(MediaManagerItem):
         """
         Remove an image item from the list
         """
+        # Turn off auto preview triggers.
+        self.listView.blockSignals(True)
         if check_item_selected(self.listView, translate('ImagePlugin.MediaItem',
             'You must select an image to delete.')):
             row_list = [item.row() for item in self.listView.selectedIndexes()]
@@ -111,6 +113,7 @@ class ImageMediaItem(MediaManagerItem):
                 self.listView.takeItem(row)
             SettingsManager.set_list(self.settingsSection,
                 u'images', self.getFileList())
+        self.listView.blockSignals(False)
 
     def loadList(self, images, initialLoad=False):
         if not initialLoad: