Description of problem:
If there is an imported Boolean type ansible variable that overrides default value then all hosts with that role will have no ansible variables assigned. 

Version-Release number of selected component (if applicable):
Satellite 6.6.1

How reproducible:
100%

Steps to Reproduce:
1. Import a role with a boolean variable
2. Import that variable as boolean into Satellite and assign a new default value
3. Assign the role to a host
3. Run the role and see if the variable was used OR check YAML output for the host to see that there are no ansible variables assigned. If you do that with a string variable then it works.

Actual results:
Variables are missing from the YAML output and not accessible from the role

Expected results:
Works as with string variables

Additional info: