Fix blueprint building

src/command_func.h

@@ -19,7 +19,7 @@
 #include "tile_map.h"
 
 struct CommandPacket;
-namespace citymania { extern void ExecuteCurrentCallback(const CommandCost &cost); }
+namespace citymania { void ExecuteCurrentCallback(const CommandCost &cost); }
 
 /**
  * Define a default return value for a failed command.
@@ -341,9 +341,10 @@ protected:
 					std::apply(callback, std::tuple_cat(std::make_tuple(Tcmd), res, args));
 				}
 			}
-			citymania::ExecuteCurrentCallback(ExtractCommandCost(res));
 		}
 
+		if (!estimate_only && !only_sending) citymania::ExecuteCurrentCallback(ExtractCommandCost(res));
+
 		return ExtractCommandCost(res).Succeeded();
 	}