ENH: add json schema validation for config files

https://gitlab.com/caosdb/caosdb-pylib/-/merge_requests/47

src/caosdb/configuration.py

@@ -83,6 +83,7 @@ def validate_yaml_schema(valobj):
         schema = yaml.load(f, Loader=yaml.SafeLoader)
     validate(instance=valobj, schema=schema["schema-pycaosdb-ini"])
 
+
 def _read_config_files():
     """Function to read config files from different paths. Checks for path in $PYCAOSDBINI or home directory (.pycaosdb.ini) and in the current working directory (pycaosdb.ini).