Creating local theme through the backend results in an exception.

[qroft]

Winter CMS Build

1.2

PHP Version

Other (please specify below)

Database engine

SQLite

Plugins installed

No response

Issue description

I can not create a theme through the backend as it results in "Cms\Classes\Theme::getConfig(): Return value must be of type array, null returned"
I also noticed that though the directory and its folders are created, the YAML file is totally empty and the composer file is NOT created.

Steps to replicate

1. Created a new project via Composer
2. Logged inside through 128.0.0.1/backend
3. Went to Settings -> Front-Theme and created a new blank theme.
4. The error appears, i am not able to get back into the themes and for example delete the just created theme.

Workaround

Create the Theme via php ARTISAN in the command line seems to work, as version.yaml and theme.yaml are created.

[LukeTowers]

Already fixed by d940617, available now on the develop branch or will be available soon in 1.2.7.