Debugged old catalog

tests/dkrz_cmip6_disk_old.json

@@ -2,7 +2,7 @@
   "esmcat_version": "0.1.0",
   "id": "mistral-cmip6",
   "description": "This is an ESM collection for CMIP6 data accessible on the DKRZ's MISTRAL disk storage system in /work/ik1017/CMIP6/data/CMIP6",
-  "catalog_file": "/mnt/lustre/work/ik1017/Catalogs/dkrz_cmip6_disk.csv.gz",
+  "catalog_file": "/work/ik1017/Catalogs/dkrz_cmip6_disk.csv.gz",
   "attributes": [
     {
       "column_name": "activity_id",