Fix warning from Cadence Incisive

The fix for PR #305 caused a new compile warning from Cadence Incisive:

  always @(*) begin end
         |
ncelab: *W,STARMT (../TestHarness.MyConfig.v,196147|9): This @* expands to empty list, will never wake up.

This change satisfies all of: VCS, Incisive, Questa, Vivado, Verilator.