Composer fails to upload a blueprint which was imported from the manager

To reproduce:

1. Upload a valid blueprint to the manager (I used the default example AWS-Basics-VM-Setup)

2. in the Local Blueprints page select the "Edit a copy in the Composer" option.

3. After the blueprint is opened in the composer try to upload it to the manager. The upload will fail, claiming that the blueprint is not valid.

This is part of the main flow of the Composer functionality. we need to resolve this for 5.1