[Validator] Complaint about no entry point only if their are aspects

plugins/fr.inria.diverse.melange/src/main/java/fr/inria/diverse/melange/validation/MelangeValidator.xtend

@@ -720,7 +720,7 @@ class MelangeValidator extends AbstractMelangeValidator
 	@Check
 	def checkEntryPoints(Language lang){
 		val entries = lang.entryPoints
-		if(entries.isEmpty && lang.ecl.isEmpty){
+		if(entries.isEmpty && lang.ecl.isEmpty && !lang.semantics.isEmpty){
 			warning(
 				"Language "+lang.name+" doesn't define entry point. An Aspect's method should be tagged with @Main to be identified as an entry point for the execution.",
 				MelangePackage.Literals.LANGUAGE__EXACT_TYPE,