guard against possible npe

src/core/lombok/javac/handlers/HandleDelegate.java

@@ -312,7 +312,7 @@ public class HandleDelegate extends JavacAnnotationHandler<Delegate> {
 		for (TypeMirror param : sig.type.getTypeVariables()) {
 			Name name = ((TypeVar) param).tsym.name;
 			
-			ListBuffer<JCExpression> bounds = types.getBounds((TypeVar) param).isEmpty() ? null : new ListBuffer<JCExpression>();
+			ListBuffer<JCExpression> bounds = new ListBuffer<JCExpression>();
 			for (Type type : types.getBounds((TypeVar) param)) {
 				bounds.append(JavacResolution.typeToJCTree(type, annotation.getAst(), true));
 			}