Fix bug in converter if authentication plugin env var not set

Type of change

• Bug Fix
• Feature

Does this introduce a change in the core logic?

• [Yes]

Does this introduce a change in the cloud provider implementation, if so which cloud?

• AWS
• Azure
• GCP
• IBM

Updates description?

ZGY Converter might have a problem if environment variable AUTHENTICATION_PLUGIN_FILE is not set even if the basic info is provided.

This has been fixed.