Show only icon + fixed width = the widget does not disappear when script returns ""

Describe the bug
The bug is simple, as in the title - when we create a script widget and we set fixed width + check in the show only icon option, then even if script returns the empty string, the widget is still visible. Unchecking fixed width makes it working correctly.

Affected input device (e.g. MacBook Trackpad, Magic Mouse/Trackpad, Touch Bar, etc.):
MAcbook Pro 2019

Device information:

  • Type of Mac: Macbook Pro 15
  • macOS version: Catalina
  • BetterTouchTool version: (please post the exact version - not just "the latest one") 3.151