Stack of runtime error fixes.

Didn't feel like digging into the DNA code to find the cause of one of the errors I got sent, if anyone feels like taking a crack at it:

runtime error: list index out of bounds
proc name: updateappearance (/proc/updateappearance)
  source file: dna.dm,257
  usr: Walter Bishop (/mob/living/carbon/human)
  src: null
  call stack:
updateappearance(Walter Bishop (/mob/living/carbon/human), "0FF0000660FF000066DC0000000000...")
Walter Bishop (/mob/living/carbon/human): Transform()

What I know: He was a changeling transforming between DNAs, apparently he somehow got a set of hair DNA that was literally off the charts for determining what hairstyle it was

git-svn-id: http://tgstation13.googlecode.com/svn/trunk@781 316c924e-a436-60f5-8080-3fe189b3f50e

code/FEA/FEA_fire.dm

@@ -138,9 +138,10 @@ obj
 			sd_SetLuminosity(3)
 
 		Del()
-			loc:active_hotspot = null
-			src.sd_SetLuminosity(0)
-			loc = null
+			if (!istype(loc, /turf/space))
+				loc:active_hotspot = null
+				src.sd_SetLuminosity(0)
+				loc = null
 
 
 			..()