Content server: Mobile page breaks if library contains empty books. Now fixed.

src/calibre/library/catalog.py

@@ -1410,7 +1410,6 @@ class EPUB_MOBI(CatalogPlugin):
                     else:
                         #if verbose: print "generating new thumbnail for %s" % title['title']
                         self.generateThumbnail(title, image_dir, thumb_file)
-
                 else:
                     # Use default cover
                     if self.verbose: print "no cover available for %s, will use default" % \

src/calibre/library/server.py

@@ -714,6 +714,10 @@ class LibraryServer(object):
 
         book, books = MarkupTemplate(self.MOBILE_BOOK), []
         for record in items[(start-1):(start-1)+num]:
+            if record[13] is None:
+                record[13] = ''
+            if record[6] is None:
+                record[6] = 0
             aus = record[2] if record[2] else __builtin__._('Unknown')
             authors = '|'.join([i.replace('|', ',') for i in aus.split(',')])
             record[10] = fmt_sidx(float(record[10]))