Allow images to blank to theme.

As none defined cos it's an image use global

Fixes: https://launchpad.net/bugs/630254

openlp/core/lib/htmlbuilder.py

@@ -145,6 +145,7 @@ body {
         }
         document.getElementById('black').style.display = black;
         document.getElementById('lyricsmain').style.visibility = lyrics;
+        document.getElementById('image').style.visibility = lyrics;
         outline = document.getElementById('lyricsoutline')
         if(outline!=null)
             outline.style.visibility = lyrics;
@@ -370,7 +371,7 @@ def build_lyrics_css(item, webkitvers):
     lyricsmain = u''
     outline = u''
     shadow = u''
-    if theme:
+    if theme and item.main:
         lyricstable = u'left: %spx; top: %spx;' % \
             (item.main.x(), item.main.y())
         lyrics = build_lyrics_format_css(theme, item.main.width(),
@@ -520,7 +521,7 @@ def build_footer_css(item):
     text-align: %s;
     """
     theme = item.themedata
-    if not theme:
+    if not theme or not item.footer:
         return u''
     if theme.display_horizontalAlign == 2:
         align = u'center'

openlp/core/lib/rendermanager.py

@@ -93,6 +93,8 @@ class RenderManager(object):
         """
         self.global_theme = global_theme
         self.theme_level = theme_level
+        self.global_theme_data = \
+            self.theme_manager.getThemeData(self.global_theme)
         self.themedata = None
 
     def set_service_theme(self, service_theme):

openlp/core/lib/serviceitem.py

@@ -170,6 +170,7 @@ class ServiceItem(object):
                         u'verseTag': slide[u'verseTag'] })
                 log.log(15, u'Formatting took %4s' % (time.time() - before))
         elif self.service_item_type == ServiceItemType.Image:
+            self.themedata = self.render_manager.global_theme_data
             for slide in self._raw_frames:
                 slide[u'image'] = resize_image(slide[u'image'],
                     self.render_manager.width, self.render_manager.height)