🐛 fix dataset cards generators instructions

Author: casenave

src/plaid/storage/cgns/writer.py

@@ -327,7 +327,7 @@ def configure_dataset_card(
 pb_defs = load_problem_definitions_from_hub(repo_id)
 
 
-pb_def = pb_defs[0]
+pb_def = next(iter(pb_defs.values()))
 
 plaid_sample = ... # use a method from above to instantiate a plaid sample
 

src/plaid/storage/hf_datasets/writer.py

@@ -327,7 +327,7 @@ def configure_dataset_card(
 pb_defs = load_problem_definitions_from_hub(repo_id)
 
 
-pb_def = pb_defs[0]
+pb_def = next(iter(pb_defs.values()))
 
 plaid_sample = ... # use a method from above to instantiate a plaid sample
 

src/plaid/storage/zarr/writer.py

@@ -463,7 +463,7 @@ def configure_dataset_card(
 pb_defs = load_problem_definitions_from_hub(repo_id)
 
 
-pb_def = pb_defs[0]
+pb_def = next(iter(pb_defs.values()))
 
 plaid_sample = ... # use a method from above to instantiate a plaid sample