FileManager Tag Cloud macro display 0 number of uploaded files pages with tags despite that those have them

[petrenkonikita112263]

Prerequisites:

• XWiki instance 15.x. I've tested on latest stable 15.9
• Latest version of File Manager (Pro). It's recommended to check if all dependencies of pro app is up to date.
• Trial license
• At least one uploaded file (multimedia/office/image)

Step to reproduce:

1. Check the home page FileManager.WebHome if there're no files, then upload them.
2. Click on any uploaded file, check the tag field. It will have WebHome tag
3. Go to any test page and add FileManager Tag Cloud to it using Quick Actions or menu toolbar or use direct code {{filetagcloud/}}

Actual result:
The tag cloud will be empty and have only line <{0} pages}">WebHome although all files have this tag. Even if custom tag is added to one file result will be same 0 <{0} pages}">image

Expected result:
The tag cloud displays the sum of pages that have the same tag.

Here's the GIF of it. Note that I've added a call of Recent Files macro for visibility of more than one file.