Malf Runtime Fix

Fix for the following runtime:

runtime error: Cannot read null.verbs
proc name: capture the station (/datum/game_mode/malfunction/proc/capture_the_station)
  source file: malfunction.dm,120
  usr: null
  src: AI malfunction (/datum/game_mode/malfunction)
  call stack:
AI malfunction (/datum/game_mode/malfunction): capture the station()