Follow up 569200eb - fixed a typo witch was caused a bug "Impossible to revert the bed shape"

+ Added error message for exception when changing the config value

src/slic3r/GUI/GUI.cpp

@@ -199,9 +199,9 @@ void change_opt_value(DynamicPrintConfig& config, const t_config_option_key& opt
 			break;
 		}
 	}
-	catch (const std::exception & /* e */)
+	catch (const std::exception &e)
 	{
-		// int i = 0;//no reason, just experiment
+		wxLogError(format_wxstr(_L("Internal error when changing value for %1%: %2%"), opt_key, e.what()));
 	}
 }