Prevent the flashing of 'Unknown error' when index is loaded but main…

…_menu is not created

modules/firmware_apps/app_store.py

@@ -143,7 +143,6 @@ def exit_available_menu():
             item_font_size=ten_pt,
         )
 
-
     def prepare_main_menu(self):
         def on_cancel():
             self.minimise()
@@ -213,8 +212,6 @@ def uninstall_app(self, app):
         eventbus.emit(InstallNotificationEvent())
         machine.reset()
 
-
-
     def error_screen(self, ctx, message):
         ctx.save()
         ctx.text_align = ctx.CENTER
@@ -268,6 +265,8 @@ def draw(self, ctx):
         clear_background(ctx)
         if self.state == "main_menu" and self.menu:
             self.menu.draw(ctx)
+        elif self.state == "main_menu" and not self.menu:
+            self.error_screen(ctx, "Loading...")
         elif self.state == "available_menu" and self.available_menu:
             self.available_menu.draw(ctx)
         elif self.state == "installed_menu" and self.installed_menu:
@@ -284,6 +283,8 @@ def draw(self, ctx):
             self.error_screen(ctx, "Connecting\nWi-Fi...\n")
         elif self.state == "refreshing_index":
             self.error_screen(ctx, "Refreshing\napp store\nindex")
+        elif self.state == "index_received":
+            self.error_screen(ctx, "App store\nindex\nreceived")
         elif self.state == "install_oom":
             self.error_screen(ctx, "Out of memory\n(app too big?)")
         elif self.state == "code_install_input" and self.codeinstall: