Ajout catch IllegalArgumentException

src/migl/lisp/LispImpl.java

@@ -317,6 +317,8 @@ public class LispImpl implements Lisp {
 			return op.apply(lisp.cdr());
 		} catch (IllegalStateException ex) {
 			throw new LispError(ex.getMessage(), ex);
+		} catch (IllegalArgumentException ex) {
+			throw new LispError("List Lisp malformed: " + ex.getMessage(), ex);
 		}
 	}