Prevent Images and Media backgrounds being added when No service Item is present in the live controller.

Fixes: https://launchpad.net/bugs/795980

openlp/core/ui/maindisplay.py

@@ -233,10 +233,12 @@ class MainDisplay(QtGui.QGraphicsView):
         API for replacement backgrounds so Images are added directly to cache
         """
         self.image_manager.add_image(name, path)
-        self.image(name)
         if hasattr(self, u'serviceItem'):
             self.override[u'image'] = name
             self.override[u'theme'] = self.serviceItem.themedata.theme_name
+            self.image(name)
+            return True
+        return False
 
     def image(self, name):
         """
@@ -349,6 +351,9 @@ class MainDisplay(QtGui.QGraphicsView):
         """
         Loads and starts a video to run with the option of sound
         """
+        # We request a background video but have no service Item
+        if isBackground and not hasattr(self, u'serviceItem'):
+            return None
         if not self.mediaObject:
             self.createMediaObject()
         log.debug(u'video')

openlp/plugins/images/lib/mediaitem.py

@@ -208,8 +208,13 @@ class ImageMediaItem(MediaManagerItem):
             filename = unicode(bitem.data(QtCore.Qt.UserRole).toString())
             if os.path.exists(filename):
                 (path, name) = os.path.split(filename)
-                self.plugin.liveController.display.directImage(name, filename)
-                self.resetAction.setVisible(True)
+                if self.plugin.liveController.display.directImage(name,
+                    filename):
+                    self.resetAction.setVisible(True)
+                else:
+                    critical_error_message_box(UiStrings().LiveBGError,
+                        translate('ImagePlugin.MediaItem',
+                        'There was no display item to amend.'))
             else:
                 critical_error_message_box(UiStrings().LiveBGError,
                     unicode(translate('ImagePlugin.MediaItem',

openlp/plugins/media/lib/mediaitem.py

@@ -114,8 +114,12 @@ class MediaMediaItem(MediaManagerItem):
             filename = unicode(item.data(QtCore.Qt.UserRole).toString())
             if os.path.exists(filename):
                 (path, name) = os.path.split(filename)
-                self.plugin.liveController.display.video(filename, 0, True)
-                self.resetAction.setVisible(True)
+                if self.plugin.liveController.display.video(filename, 0, True):
+                    self.resetAction.setVisible(True)
+                else:
+                    critical_error_message_box(UiStrings().LiveBGError,
+                        translate('MediaPlugin.MediaItem',
+                        'There was no display item to amend.'))
             else:
                 critical_error_message_box(UiStrings().LiveBGError,
                     unicode(translate('MediaPlugin.MediaItem',