Don't trigger warning / error if configuration value is nil.

This makes getStringFromTable() and getIntFromTable() only return errors
if there's a type mismatch.

Example: 'name' should be a 'string'. If it's a number, an error is
triggered.

config.go

@@ -20,27 +20,27 @@ type Configuration struct {
 }
 
 // getStringFromTable retrieves a string from a table on the lua stack using the key passed in.
+//
+//	If the value is nil, 'out' is unchanged.
 func getStringFromTable(L *lua.LState, lobj lua.LValue, key string, out *string) (bool, error) {
 	lv := L.GetTable(lobj, lua.LString(key))
 	if text, ok := lv.(lua.LString); ok { // Value is string
 		*out = string(text)
 	} else if _, ok := lv.(*lua.LNilType); !ok { // Value is not a string, and is not nil
 		return true, errors.New("'" + key + "' is not a string")
-	} else { // Value is nil
-		return false, errors.New("'" + key + "' is nil")
 	}
 	return true, nil
 }
 
 // getIntFromTable retrieves an integer from a table on the Lua stack using the key passed in.
+//
+//	If the value is nil, 'out' is unchanged.
 func getIntFromTable(L *lua.LState, lobj lua.LValue, key string, out *int64) (bool, error) {
 	lv := L.GetTable(lobj, lua.LString(key))
 	if int, ok := lv.(lua.LNumber); ok { // Value is number
 		*out = int64(int)
 	} else if _, ok := lv.(*lua.LNilType); !ok { // Value is not a number, and is not nil
 		return true, errors.New("'" + key + "' is not a number")
-	} else { // Value is nil
-		return false, errors.New("'" + key + "' is nil")
 	}
 	return true, nil
 }