Fix missing dependency error

Author: laciKE

intelmq/bots/parsers/stix/parser.py

@@ -9,6 +9,7 @@
 
 
 from intelmq.lib.bot import ParserBot
+from intelmq.lib.exceptions import MissingDependencyError
 
 try:
     import stix2patterns.v21.pattern as stix2_pattern