Feature Request: Remove query parameter if empty string

[tyricec]

Hello,

Thanks for this plugin, works great for our team. Currently, I'm having an issue with an API not accepting an empty string value when a query parameter is sent. For example, foo="" results in a 500 with the reason being that "foo must be set to info, critical, or warning". I was wondering if adding an additional checkbox for a parameter to not be sent makes sense to do. At the moment, I'm not sure how this could be communicated to the user either.