Configuring custom theme is confusing and checks is not working

[muyncky]

What is you're custom theme's folder name, that we need to exclude from upgrading?themes/non-existing-theme
12:16:21 /var/www/html/themes/themes/non-existing-theme does not exist
What is you're custom theme's folder name, that we need to exclude from upgrading?themes/nonexisting
12:17:07 /var/www/html/themes/themes/nonexisting does not exist
What is you're custom theme's folder name, that we need to exclude from upgrading?

[zakiblauwfruit]

https://github.com/blauwfruit/juice/commit/9ab76703c1fc1a31ef32d3429f5e3b48af56c9f8