Revert "RadioAccessSpecifier converter don't return null"

This reverts commit 47ee601faf9d4a393ff974adc51fb38bea9fc525.

Reason for revert: b/258753599

Change-Id: If6b79fb41601873969347b105d84e7b88a0b9cab
(cherry picked from commit e2302476363d11865d2a85cfd5f5918c5964d796)
Merged-In: If6b79fb41601873969347b105d84e7b88a0b9cab
1 file changed