only download cover if online

oml/item/models.py

@@ -441,6 +441,7 @@ class Item(db.Model):
         logger.debug('%s update_preview done', self.id)
 
     def update_icons(self):
+        if state.online:
             self.update_cover()
         self.update_preview()
 
@@ -673,6 +674,8 @@ class File(db.Model):
             return re.sub('^\.|\.$|:|/|\?|<|>', '_', string)
         prefs = settings.preferences
         prefix = os.sep.join(os.path.join(os.path.expanduser(prefs['libraryPath']), 'Books/').split('/'))
+        if not self.item:
+            return
         j = self.item.json()
 
         current_path = self.fullpath()
@@ -794,9 +797,9 @@ def update_sort_table():
             for q in sql:
                 s.connection().execute(q)
             s.commit()
+    sql = []
     layout = db.get_layout()
     sort_indexes = [i[len('ix_sort_'):] for i in layout['indexes'] if i.startswith('ix_sort_')]
-    sql = []
     for col in set(Item.sort_keys)-set(sort_indexes):
         sql.append('CREATE INDEX ix_sort_{col} ON sort ({col})'.format(col=col))
     if not 'sortvalue' in db.get_table_columns('find'):