added input cancelling to pda msg, chemmaster ops, borg mod selection

code/modules/mob/living/silicon/robot/life.dm

@@ -26,11 +26,12 @@
 
 /mob/living/silicon/robot/proc/use_power()
 	if (is_component_functioning("power cell") && cell)
-		for(var/obj/item/borg/B in module.modules)
-			if(B.powerneeded)
-				if((cell.charge * 100 / cell.maxcharge) < B.powerneeded)
-					src << "Deactivating [B.name] due to lack of power!"
-					unEquip(B)
+		if(module)
+			for(var/obj/item/borg/B in module.modules)
+				if(B.powerneeded)
+					if((cell.charge * 100 / cell.maxcharge) < B.powerneeded)
+						src << "Deactivating [B.name] due to lack of power!"
+						unEquip(B)
 		if(src.cell.charge <= 0)
 			uneq_all()
 			update_headlamp(1)

code/modules/mob/living/silicon/robot/robot.dm

@@ -224,7 +224,9 @@ var/list/robot_verbs_default = list(
 		modules = list("Peacekeeper")
 	if(mmi != null && mmi.alien)
 		modules = "Hunter"
-	modtype = input("Please, select a module!", "Robot", null, null) in modules
+	modtype = input("Please, select a module!", "Robot", null, null) as null|anything in modules
+	if(!modtype)
+		return
 	designation = modtype
 	var/module_sprites[0] //Used to store the associations between sprite names and sprite index.