Runtime fix:  RP_Revolution's auto_add_rev_head loves that null.

runtime error: Cannot read null.client
proc name: process (/datum/game_mode/revolution/rp_revolution/process)
  source file: rp_revolution.dm,198
runtime error: Cannot read null.client
proc name: process (/datum/game_mode/revolution/rp_revolution/process)
  source file: rp_revolution.dm,198
runtime error: Cannot read null.client
proc name: process (/datum/game_mode/revolution/rp_revolution/process)
  source file: rp_revolution.dm,198
runtime error: Cannot read null.client
proc name: process (/datum/game_mode/revolution/rp_revolution/process)
  source file: rp_revolution.dm,198
runtime error: Cannot read null.client
proc name: process (/datum/game_mode/revolution/rp_revolution/process)
  source file: rp_revolution.dm,198
runtime error: Cannot read null.client
proc name: process (/datum/game_mode/revolution/rp_revolution/process)
  source file: rp_revolution.dm,198
Runtime fix:  OH GOD NOT THE BEEs WON'T SOMEONE CALM THEM DOWN?

Other then NULL?

runtime error: Cannot read null.type
proc name: Life (/mob/living/simple_animal/bee/Life)
  source file: bees.dm,91
runtime error: Cannot read null.type
proc name: Life (/mob/living/simple_animal/bee/Life)
  source file: bees.dm,91
runtime error: Cannot read null.type
proc name: Life (/mob/living/simple_animal/bee/Life)
  source file: bees.dm,91
runtime error: Cannot read null.type
proc name: Life (/mob/living/simple_animal/bee/Life)
  source file: bees.dm,91
runtime error: Cannot read null.type
proc name: Life (/mob/living/simple_animal/bee/Life)
  source file: bees.dm,91
runtime error: Cannot read null.type
proc name: Life (/mob/living/simple_animal/bee/Life)
  source file: bees.dm,91
runtime error: Cannot read null.type
proc name: Life (/mob/living/simple_animal/bee/Life)
  source file: bees.dm,91
runtime error: Cannot read null.type
proc name: Life (/mob/living/simple_animal/bee/Life)
  source file: bees.dm,91
Runtime fix:  Sparks trying to delete that which does not exist.

runtime error: Cannot execute null.delete().
proc name: start (/datum/effect/effect/system/spark_spread/start)
  source file: effect_system.dm,204
  usr: Mark Hoover (/mob/living/carbon/human)
  src: /datum/effect/effect/system/sp... (/datum/effect/effect/system/spark_spread)
  call stack:
/datum/effect/effect/system/sp... (/datum/effect/effect/system/spark_spread): start()
runtime error: Cannot execute null.delete().
proc name: start (/datum/effect/effect/system/spark_spread/start)
  source file: effect_system.dm,204
  usr: Mark Hoover (/mob/living/carbon/human)
  src: /datum/effect/effect/system/sp... (/datum/effect/effect/system/spark_spread)
  call stack:
/datum/effect/effect/system/sp... (/datum/effect/effect/system/spark_spread): start()
Merge pull request #4481 from Ccomp5950/runtimefixes

Runtimefixes 2 electric boogaloo or how I learned to love null checks.