Description of the problem:
 
Suppling garbage values to mta workflow will complete successfully, but should indicate that the workflow had an error. **
How reproducible:

100%

Steps to reproduce:

1. Deploy Orchestrator 0.2.3 

2. Deploy workflows 

3. Run MTA workflow with url https://foo.bar

Actual results:

MTA workflow completes successfully

Expected results:

MTA workflow shows error state