fix: empty procedure arrays in serialization

[BeksOmega]

The basics

• I branched from develop
• My pull request is against develop
• My code follows the style guide
• I ran npm run format and npm run lint

The details

Resolves

Fixes N/A

Proposed Changes

Makes it so that ifthere are no procedure models in the workspace the procedure serializer returns null.

Behavior Before Change

Workspaces without procedure models would be serialized as:

{
  'procedures': [],
}

Behavior After Change

Workspaces without procedure models are serialized as:

{ }

Reason for Changes

The tiniest amount of space saving.

Test Coverage

N/A

Documentation

N/A

Additional Information

N/A