When clear all filters, no products are shown

Hello!
I adjusted filters with manufacturers.
I have such usercase:

1)When they are empty: all products are shown.
Then say, I select 'The manufacturer' checkbox.
It causes displaying of products of 'The manufacturer'

2) Then, I remove this one checkbox and Hikashop displays no products or products without
manufacturers.
How to do this: if no products selected show always all products

I use the latest version.
in
/administrator/components/com_hikashop/classes/filter.php

I added

if(isset($infoGet[0])){
$infoGet[0] = trim($infoGet[0]);
}
in two places to remove space in $infoGet[0].

After all checkboxes were removed this space broke all.

now it works

Well, I can't reproduce the bug on my end but if it works this solution could be helpful.
Where did you add your code?