Description of the problem:
In the software template, there is the option to enter no input in the sw.yaml. When a workflow created with the basic software template is executed with no input entered in the field, the workflow fails with error claiming that it is required for execution:

ExecuteWorkflowRequestDTO.inputData is required for executing workflow with id <workflow id>

How reproducible: 100%

Steps to reproduce:

1. Deploy orchestrator using operator v1.3.0-rc6. Template source: https://github.com/parodos-dev/workflow-software-templates/blob/v1.3.x/scaffolder-templates/basic-workflow/template.yaml

2. Create a workflow from the basic template and execute it without entering any data.

Actual results: Workflow crashes and does not create an instance.

Expected results: Workflow should execute normally.