Merge pull request #15433 from Citadel-Station-13/chem_synth

fixes debug chemical synthesizers

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

@@ -53,10 +53,10 @@
 				return
 			beaker = new /obj/item/reagent_containers/glass/beaker/bluespace(src)
 			visible_message("<span class='notice'>[src] dispenses a bluespace beaker.</span>")
-		if("amount")
-			var/input = text2num(params["amount"])
+		if("synth_amount")
+			var/input = text2num(params["synth_amount"])
 			if(input)
-				amount = input
+				amount = max(input, 0)
 	update_icon()
 
 /obj/machinery/chem_dispenser/chem_synthesizer/proc/find_reagent(input)

tgui/packages/tgui/interfaces/ChemDebugSynthesizer.js

@@ -33,8 +33,8 @@ export const ChemDebugSynthesizer = (props, context) => {
                 maxValue={beakerMaxVolume}
                 step={1}
                 stepPixelSize={2}
-                onChange={(e, value) => act('amount', {
-                  amount: value,
+                onChange={(e, value) => act('synth_amount', {
+                  synth_amount: value,
                 })} />
               <Button
                 icon="plus"