Micro AIs: only display on-screen error messages when in debug mode

changelog

@@ -32,6 +32,7 @@ Version 1.13.0-dev:
    * Fix bug in Return Guardian and Goto Micro AIs when there is no path to
      the goal hex
    * Several fixes of translatable strings in Micro AIs
+   * Micro AIs: only display on-screen error messages when in debug mode
  * Campaigns:
    * Changed all occurrences of {FLAG_VARIANT ragged} to {FLAG_VARIANT6 ragged}
    * Singleplayer campaign creation now utilizes the create, configure,

data/ai/lua/ai_helper.lua

@@ -127,8 +127,10 @@ end
 ----- AI execution helper functions ------
 
 function ai_helper.checked_action_error(action, error_code)
+    if wesnoth.game_config.debug then
         wesnoth.message('Lua AI error', 'If you see this message, something has gone wrong. Please report this on the Wesnoth forums, ideally with a replay and/or savegame.')
         error(action .. ' could not be executed. Error code: ' .. error_code)
+    end
 end
 
 function ai_helper.checked_attack(ai, attacker, defender, weapon)