Data validation on User Story JSON file is missing - API service crashes

[arturonuman]

Steps to reproduce it:

• Making use of an existing User Story JSON file, leave blank the 'source' property.
• Reload the dashboard's home page.

Expected Behaviour:

• Data validation should be in place when reading User Story JSON files.
• The dashboard's home page should load all remaining User Story JSON files except for the one with errors (missing a mandatory value or with an invalid/malformed json structure).
• Let the user know, with an appropriate error message, the errors while loading the User Story.

Actual Behaviour:

• The dashboard's home page doesn't load correctly.
• The console error message is "Failed to load resource: net::ERR_CONNECTION_REFUSED"
• The API service crashes.