kill last empty string literal

diff --git a/lib/SQL/Abstract.pm b/lib/SQL/Abstract.pm
index 092598b..2600fe9 100644 (file)
--- a/lib/SQL/Abstract.pm
+++ b/lib/SQL/Abstract.pm
@@ -517,7 +517,7 @@ sub _expand_expr {
           sort keys %$expr
       ] };
     }
-    return { -literal => [ '' ] } unless keys %$expr;
+    return undef unless keys %$expr;
     return $self->_expand_expr_hashpair(%$expr, $logic);
   }
   if (ref($expr) eq 'ARRAY') {