fix: Added an object checking
fix: Added an object checking

- Checking if there are objects in the event, and then if there is at least 1 transaction object
- This prevents the module from crashing, but does not guaranty having a valid GoAML file (depending on objects and their relations)
VirusTotal/misp-modules,amuehlem/misp-modules,VirusTotal/misp-modules,MISP/misp-modules,amuehlem/misp-modules,MISP/misp-modules,MISP/misp-modules,VirusTotal/misp-modules,amuehlem/misp-modules