"workflow_dispatch" is not handled

[AlexisNeveu]

Describe the bug

When trying to draw a job containing the field named "workflow_dispatch", it does not draw the model.
(Does not work either when deleting one or the other sub-field in the screenshots below)
To Reproduce

Steps to reproduce the behavior:

1. Go to the text view
2. Type a code with a job containing a "workflow_dispatch" field
3. Click on 'draw'
4. See that it is not correctly drawn

Expected behavior
The "workflow_dispatch" field should be accepted and the rest of the model should be drawn correctly.

Screenshots

Application (please complete the following information):

• leto-modelizer commit hash 280a6e5ffd4bcb75bc8e3c8d4e20c787ea067222
• githubator-plugin commit hash b02edb8

Desktop (please complete the following information):

• OS: Ubuntu
• Browser FireFox