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/modules/mob/dead/observer/observer.dm

@@ -44,7 +44,7 @@
 	..()
 	statpanel("Status")
 	if (src.client.statpanel == "Status")
-		if(ticker.mode != null)
+		if(ticker.mode)
 			//world << "DEBUG: ticker not null"
 			if(ticker.mode.name == "AI malfunction")
 				//world << "DEBUG: malf mode ticker test"