Skip importing of catalog source data if source type is null

[mpgxvii]

Description:

• Fix auto-import failure when data sources are missing type, which prevented remaining sources from importing

Fixes RADAR-base/RADAR-Schemas#413

Checklist:

• The Main workflow has succeeded
• The Gatling tests have passed
• I have logged into the portal running locally with default admin credentials
• I have updated the README files if this change requires documentation update
• I have commented my code, particularly in hard-to-understand areas