Find/Replace does not allow replace with empty string

I am trying to reorganize my windows without the “Main Windows” folder. So I want to do a global find/replace of “Main Windows/’ and replace with an empty string (”"), but that is not allowed by the find / replace dialog.

Ignition 7.8.0
Java 1.8.0_65
Windows 7

This is a known issue that was fixed in Ignition 7.8.1