bug description
When hrvar is set to NULL in create_boxplot. We have “Total” on the x-axis, two times. This won't look good in visual.

To Reproduce
Run below code to reproduce the issue.
create_boxplot(pq_data, metric = "Collaboration_hours", hrvar = NULL, return = "plot")

Expected behavior
In this special case x-axis label can be removed.

Screenshots

Improvement
We can remove x-axis label in this special case, where hrvar is set to NULL.