Resource Management: Is there a way to hide unassigned roles on the Resource Planner (View By Project)

I am using the resource Planner (View by Project) and have applied a filter to exclude unwanted projects. But when I expand the project I see ALL our job roles. How can I filter the resource planner so I only see the roles with assignments. 

Current behavior: When I expand the projects all roles are displayed whether or not they are assigned to the project or have planned hours.

• Project X
  • Role A    5h    9h    9h     2h
  • Role B    0h    0h    0h     0h
  • Role C    0h    0h    0h     0h
  • Role D    0h    0h    0h     0h
  • Role F    5h    5h    5h     5h
  • Role G    0h    0h    0h     0h

Desired behavior: Only show roles that have planned hours.

• Project X
  • Role A    5h    9h    9h     2h
  • Role F    5h    5h    5h     5h