[draft] Broken `create_catalog.py`

[dan-fernandes]

Issue

The example_configs/catalog/create_catalog.py script returns a NoneType error in the latest version of Tiled. This appears to be due to a configuration error blocking the instantiation of an object required for database access.

Thoughts

Through git bisect the problem first appears in 5468781cf5d74716b1a5e1789b14bf7a4cfb7764, most likely due to an indentation error at tiled/server/app.py:470.

Fixing this, the script complains that there's no such table: roles in the created database. Bisecting again leads us to 906100d1f5620c712faf825d50acfcb26e34d2e0