Fix 'dictionary keys changed during iteration' error

scripts/lib/config_builder.py

@@ -6,6 +6,7 @@
 import json
 from collections import defaultdict
 from pathlib import PurePath
+from copy import deepcopy
 
 # Set up debugging
 LOCAL_LOGGER = logging.getLogger(__name__)
@@ -131,12 +132,15 @@ def create_json_config(self, output_filename, dest_dir, params):
 
         # Are there any group names to be renamed?
         if hasattr(params, 'grp_rename_list'):
+            grp_clone = deepcopy(config_dict['groups'])
             for from_name, to_name in params.grp_rename_list:
                 for grp in config_dict['groups']:
                     # Case insensitive compare
                     if grp.casefold() == from_name.casefold():
                         LOCAL_LOGGER.debug(f"Renaming group labels: {to_name} renamed to {from_name}")
-                        config_dict['groups'][to_name] = config_dict['groups'].pop(grp)
+                        grp_clone[to_name] = grp_clone.pop(grp)
+                        break
+            config_dict['groups'] = grp_clone
 
         # Is there a proj4 definition?
         if hasattr(params, 'proj4_defn'):