Adding missing option in filters

In production we got a use case when searching for records without responses was important.
That was not easy out of the box and required typing in the free search input in Spider.

To ease our lives, I added the feature to have 'missing' option in some filters drop down.

This option is only on some filters that may indeed have no value:

• Identification
• Status / Code
• Request content-type
• Response content-type
• Tags

When selected, it is shown in the list as any other filter option:

But a specific filter is generated behind the scenes:

Cheers,
Thibaut