Update cms_toolbars.py

[vrac10]

Description

Currently, the default argument list 'action_args' accumulates the data from previous executions. This pull request makes sure that the default argument always has an empty list as intended.

Fixes #535

Type of change

• [x] Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

• [x] Calling the function again and testing it shows that the previous execution data isn't accumulated in the default parameter

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have not added a commit to any .db files as part of my pull request
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] My changes generate no new warnings
• [x] Any dependent changes have been merged and published in downstream modules

[botanicvelious]

@warthog9 what do you think?

[terriko]

Closing in preparation for archiving this repo.