Treat undefined variables as empty string in tests.

This prevents warnings when using comparison attributes together with
variables that are undefined.

diff --git a/general/interpolate_fancy b/general/interpolate_fancy
index c4557698c18a740220a1f35ed99be4668e1d4ab5..4b8b759777373a01aa5093a56b6d6b4151caeb2e 100644 (file)
--- a/general/interpolate_fancy
+++ b/general/interpolate_fancy
@@ -155,6 +155,11 @@ sub do_interpolate {
 
 sub _test {
   my($variable, $attr) = @_;
+  # If the variable is not defined, treat it as the empty string in
+  # comparisons below
+  if (!defined $variable) { 
+    $variable = '';
+  }
   my $attributes = interpolate_fancy::_attributes($attr);
 
   defined $attributes->{eq} and return $variable eq $attributes->{eq};