"Not Found" message with Filters

Quickly googled with site:hikashop.com and didnt find a stuff on this point.

If I filter with the parameter which none of the products have at the moment, I am given just the blank-page with no information about it. Can I create a custom message without php knowledge?

Also I found in one of the topics, that there is no way of resetting the filter's parameters. Except the user-session ends (default way as far as I get). Are the things still the same?

It's not possible to add a message without some PHP knowledge.

The filter can be reseted by the customer, in the options of the filter you can set it as a deletable filter.