-Added an "inuse" check for the Light Replacer.

-The Light Replacer will drop the replaced lights once again.
-Fixed a runtime with the Plantbag and the All-In-One grinder.

git-svn-id: http://tgstation13.googlecode.com/svn/trunk@4175 316c924e-a436-60f5-8080-3fe189b3f50e

code/modules/chemical/Chemistry-Machinery.dm

@@ -748,7 +748,8 @@
 			if((holdingitems && holdingitems.len >= limit) || beaker.reagents.total_volume >= 80) //Sanity checking so the blender doesn't overfill
 				user << "You fill the All-In-One grinder to the brim."
 				break
-		if(src.contents.len < limit && src.reagents.total_volume < 80)
+
+		if(!O.contents.len)
 			user << "You empty the plant bag into the All-In-One grinder."
 
 		src.updateUsrDialog()