t / t4101 / diff.3-2on commit t1308: relax the test verifying that empty alias values are disallowed (e4feff4)
   1--- a/frotz
   2+++ b/frotz
   3@@ -1,3 +1,2 @@
   4 a
   5-c
   6 b
   7\ No newline at end of file