First level attribute can be unbound

[janjagusch]

There is a change that you never enter the while loop, which makes the first_level attribute undefined.

quetz/quetz/config.py

Lines 395 to 408 in efcfdb8

	idx = 2
	# look for the first level of config_map.
	# It must be done in loop as the key itself can contains '_'.
	while idx < len(splitted_key):
	first_level = self._find_first_level_config(config_key)
	if first_level:
	break
	config_key += f"_{ splitted_key[idx].lower()}"
	idx += 1
	# no first_level found, the variable is useless.
	if not first_level:
	continue

This can cause the following error.

UnboundLocalError: cannot access local variable 'first_level' where it is not associated with a value

I feel like this should have been caught by some pre-commit hook (e.g. mypy).

[janjagusch]

Doesn't seem to be so easy to catch this with a pre-commit hook (see python/mypy#2400).