Harden a bit from_csv

arkindex/documents/management/commands/from_csv.py

@@ -78,7 +78,7 @@ class Command(BaseCommand):
         with open(options['csv']) as csvfile:
             csvreader = csv.reader(csvfile)
             next(csvreader)
-            data = list(csvreader)
+            data = list(filter(None, csvreader))
 
         logger.debug('Setting up Django')
         os.environ.setdefault("DJANGO_SETTINGS_MODULE", "arkindex.project.settings")