Error in sampling QC

[zouharvi]

This did not happen for wave seed 0 1 2 3 but did fire up for 4 for example:

Traceback (most recent call last):
  File "/home/vilda/ErrorSpanAnnotations/./preparation/wmt24/prepare_batches_main.py", line 236, in <module>
    task_docs.append(quality_control.create_bad_document(
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/vilda/ErrorSpanAnnotations/preparation/wmt24/quality_control.py", line 20, in create_bad_document
    doc_bad = copy.deepcopy(data_docs.pop(RANDOM_SAMPLE_BAD.choice(docs_available)))
                                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/vilda/miniconda3/lib/python3.11/random.py", line 373, in choice
    raise IndexError('Cannot choose from an empty sequence')