schema spy reports indexes as blanks for functional indexes

[bradfordcondon]

noticed this on the feature index, index 5:

https://laceysanderson.github.io/chado-docs/tables/feature.html

looks like hte index is there and fine, but it gets reported as a null in schema spy

here it is in my PHPstorm:

-- auto-generated definition
create index feature_idx5
  on feature (lower(name :: text));