ignore empty lines when importing list of disabled accounts

extra/modules/bodiffusion.ptl

@@ -800,6 +800,8 @@ class DiffusionDirectory(Directory):
                 reader = csv.reader(self.csvfile, dialect)
 
                 for line in reader:
+                    if not line:
+                        continue
                     email = line[0]
                     try:
                         user = User.get(email)