Added exception for missing schema and added intelmq user to the crontab suggestion.

Author: elsif2

docs/user/bots.rst

@@ -1622,7 +1622,7 @@ The report configuration is stored in a `shadowserver-schema.json` file download
 
 The parser will attempt to download a schema update on startup when the *auto_update* option is enabled.
 
-Schema downloads can also be scheduled as a cron job:
+Schema downloads can also be scheduled as a cron job for the `intelmq` user:
 
 .. code-block:: bash
 

intelmq/bots/parsers/shadowserver/_config.py

@@ -318,7 +318,7 @@ def reload():
         if __config.schema_mtime == mtime:
             return
     else:
-        __config.logger.info("The schema file does not exist.")
+        raise ValueError("The schema file does not exist.")
 
     if __config.schema_mtime == 0.0 and mtime == 0.0 and __config.auto_update:
         update_schema()