nautilus-files-view: update comma placement for primary status

Extra space before comma in folder, item count when files in folders are
not counted.

The issue occurs when search preview file count seleted value, is set to none.
An extra white space occurs before he comma.

To fix the issue, the comma placement is moved if the file folder count is null
or empty.

Fixes: GNOME/nautilus#1867
2 jobs for my_work in 6 minutes and 13 seconds
Status Job ID Name Coverage
  Test
passed #1317185
flatpak
flatpak devel

00:06:13

passed #1317186
style check

00:01:10