Use "LangUtils.nullToLangVoid()" in "func.combXA()"

Author: JDDev0

src/main/java/at/jddev0/lang/LangPredefinedFunctions.java

@@ -6598,8 +6598,8 @@ public static DataObject combXAFunction(
 
 			return interpreter.callFunctionPointer(aFunc, a.getVariableName(), LangUtils.separateArgumentsWithArgumentSeparators(
 					Arrays.asList(
-							retB1 == null?new DataObject().setVoid():retB1,
-							retB2 == null?new DataObject().setVoid():retB2
+							LangUtils.nullToLangVoid(retB1),
+							LangUtils.nullToLangVoid(retB2)
 					)
 			), SCOPE_ID);
 		}