Returning validation failures while creating organization

[pc9795]

Description

This PR handles the exceptions which are thrown by the validation API. Also added a clear message for validation failure when creating an organization with no "name" field.

Fixes #604

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

• Manually using Postman
• Unit tests

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes