chem dispenser fix

Author: SapphicOverload

code/_onclick/hud/screen_objects.dm

@@ -190,9 +190,9 @@
 				return TRUE
 			if(allocated_points + params["amount"] < user.get_skill(params["skill"]))
 				return TRUE
-			if(allocated_skills[params["skill"]] + params["amount"] > (4 + HAS_TRAIT(user, TRAIT_EXCEPTIONAL_SKILL)))
+			if(allocated_skills[params["skill"]] + params["amount"] + user.get_skill(params["skill"]) > (4 + HAS_TRAIT(user, TRAIT_EXCEPTIONAL_SKILL)))
 				return TRUE
-			if(allocated_skills[params["skill"]] + params["amount"] < user.get_skill(params["skill"]))
+			if(allocated_skills[params["skill"]] + params["amount"] < 0)
 				return TRUE
 			allocated_skills[params["skill"]] += params["amount"]
 			allocated_points += params["amount"]

code/modules/reagents/chemistry/machinery/chem_dispenser.dm

@@ -265,7 +265,7 @@
 			if(!is_operational() || QDELETED(cell))
 				return
 			var/reagent = GLOB.name2reagent[params["reagent"]]
-			if(beaker && dispensable_reagents.Find(reagent))
+			if(beaker && can_display_reagent(usr, reagent))
 				var/datum/reagents/R = beaker.reagents
 				var/free = R.maximum_volume - R.total_volume
 				var/actual = min(amount, (cell.charge * powerefficiency)*10, free)