Workaround for blueprint update bug

thanks to Honktown for the help

changelog.txt

@@ -1,4 +1,9 @@
 ---------------------------------------------------------------------------------------------------
+Version: 1.1.3
+Date: 2021-09-06
+  Bugfixes:
+    - Implemented controlled error message for blueprint update bug in factorio to avoid crash
+---------------------------------------------------------------------------------------------------
 Version: 1.1.2
 Date: 2021-08-21
   Changes:

control.lua

@@ -552,6 +552,13 @@ script.on_event(defines.events.on_player_setup_blueprint, function (event)
 	local blueprint = nil
 	if player and player.blueprint_to_setup and player.blueprint_to_setup.valid_for_read then blueprint = player.blueprint_to_setup
 	elseif player and player.cursor_stack.valid_for_read and player.cursor_stack.name == "blueprint" then blueprint = player.cursor_stack end
+	
+	-- Workaround for blueprint update bug
+	if blueprint.get_blueprint_entity_count() == 0 then
+		player.print({"display-plates.blueprint-wont-have-icons"})
+		return
+    end
+	
 	if blueprint then
 		for index,entity in pairs(event.mapping.get()) do
 			local stype,sname = get_render_sprite_info(entity)

info.json

@@ -1,6 +1,6 @@
 {
 	"name": "IndustrialDisplayPlates",
-	"version": "1.1.2",
+	"version": "1.1.3",
 	"title": "Industrial Display Plates",
 	"author": "Wyrrrd",
 	"homepage": "https://github.com/Wyrrrd/IndustrialDisplayPlates",

locale/de/strings.cfg

@@ -1,3 +1,6 @@
+[display-plates]
+blueprint-wont-have-icons=Dieser aktualisierte Blaupause wird keine Symbole oder Kartenmarkierungen der Anzeigeplatten enthalten. Um diese hinzuzufügen, erstelle eine neue Blaupause.
+
 [entity-name]
 copper-display=Kupferanzeigeplatte (groß)
 iron-display=Eisenanzeigeplatte (groß)

locale/en/strings.cfg

@@ -1,3 +1,6 @@
+[display-plates]
+blueprint-wont-have-icons=This updated blueprint will not contain any icons or map markers of the display plates. To include them, create a new blueprint.
+
 [entity-name]
 copper-display=Copper display plate (large)
 iron-display=Iron display plate (large)

locale/fr/strings.cfg

@@ -1,3 +1,6 @@
+[display-plates]
+blueprint-wont-have-icons=UNLOCALIZED ERROR
+
 [entity-name]
 copper-display=Panneau d'affichage en Cuivre (Grand)
 iron-display=Panneau d'affichage en Fer (Grand)