Chemistry machinery fixes.

Makes Topic() calls check parent. Adds proper operable() checks where applicable.
Makes the interact_offline only affect the NOPOWER flag.
Fixes #11116. Fixes #11302.

code/game/machinery/machinery.dm

@@ -195,7 +195,10 @@ Class Procs:
 	return (stat & (NOPOWER|BROKEN|additional_flags))
 
 /obj/machinery/CanUseTopic(var/mob/user)
-	if(!interact_offline && (stat & (NOPOWER|BROKEN)))
+	if(stat & BROKEN)
+		return STATUS_CLOSE
+
+	if(!interact_offline && (stat & NOPOWER))
 		return STATUS_CLOSE
 
 	return ..()

code/modules/reagents/Chemistry-Machinery.dm

@@ -80,13 +80,8 @@
 	return
 
 /obj/machinery/chem_master/Topic(href, href_list)
-	if(stat & (BROKEN|NOPOWER)) return
-	if(usr.stat || usr.restrained()) return
-	if(!in_range(src, usr)) return
-
-	src.add_fingerprint(usr)
-	usr.set_machine(src)
-
+	if(..())
+		return 1
 
 	if (href_list["ejectp"])
 		if(loaded_pill_bottle)
@@ -236,7 +231,7 @@
 	return src.attack_hand(user)
 
 /obj/machinery/chem_master/attack_hand(mob/user as mob)
-	if(stat & BROKEN)
+	if(inoperable())
 		return
 	user.set_machine(src)
 	if(!(user.client in has_sprites))
@@ -345,11 +340,8 @@
 
 
 /obj/machinery/computer/pandemic/Topic(href, href_list)
-	if(stat & (NOPOWER|BROKEN)) return
-	if(usr.stat || usr.restrained()) return
-	if(!in_range(src, usr)) return
-
-	usr.set_machine(src)
+	if(..())
+		return 1
 	if(!beaker) return
 
 	if (href_list["create_vaccine"])
@@ -657,10 +649,12 @@
 	return 0
 
 /obj/machinery/reagentgrinder/attack_hand(mob/user as mob)
-	user.set_machine(src)
 	interact(user)
 
 /obj/machinery/reagentgrinder/interact(mob/user as mob) // The microwave Menu
+	if(inoperable())
+		return
+	user.set_machine(src)
 	var/is_chamber_empty = 0
 	var/is_beaker_ready = 0
 	var/processing_chamber = ""
@@ -707,8 +701,8 @@
 
 /obj/machinery/reagentgrinder/Topic(href, href_list)
 	if(..())
-		return
-	usr.set_machine(src)
+		return 1
+
 	switch(href_list["action"])
 		if ("grind")
 			grind()
@@ -717,7 +711,7 @@
 		if ("detach")
 			detach()
 	src.updateUsrDialog()
-	return
+	return 1
 
 /obj/machinery/reagentgrinder/proc/detach()
 

code/modules/reagents/dispenser/dispenser2.dm

@@ -113,9 +113,6 @@
 		return ..()
 
 /obj/machinery/chemical_dispenser/ui_interact(mob/user, ui_key = "main",var/datum/nanoui/ui = null, var/force_open = 1)
-	if(stat & (BROKEN|NOPOWER)) return
-	if(user.stat || user.restrained()) return
-
 	// this is the data which will be sent to the ui
 	var/data[0]
 	data["amount"] = amount
@@ -148,8 +145,8 @@
 		ui.open()
 
 /obj/machinery/chemical_dispenser/Topic(href, href_list)
-	if(stat & (NOPOWER|BROKEN))
-		return 0 // don't update UIs attached to this object
+	if(..())
+		return 1
 
 	if(href_list["amount"])
 		amount = round(text2num(href_list["amount"]), 1) // round to nearest 1
@@ -171,9 +168,7 @@
 	return 1 // update UIs attached to this object
 
 /obj/machinery/chemical_dispenser/attack_ai(mob/user as mob)
-	src.attack_hand(user)
+	ui_interact(user)
 
 /obj/machinery/chemical_dispenser/attack_hand(mob/user as mob)
-	if(stat & BROKEN)
-		return
 	ui_interact(user)