Uncaught error in `curate transform-strain-name`

[corneliusroemer]

Curate seems to struggle with null JSON values?

$  augur curate transform-strain-name \
                --strain-regex '^.+$' \
                --backup-fields submissionId accession
...
Traceback (most recent call last):
  File "/Users/cr/code/augur/augur/__init__.py", line 71, in run
    return args.__command__.run(args)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/cr/code/augur/augur/curate/__init__.py", line 246, in run
    dump_ndjson(validated_output_records)
  File "/Users/cr/code/augur/augur/io/json.py", line 89, in dump_ndjson
    for item in iterable:
                ^^^^^^^^
  File "/Users/cr/code/augur/augur/curate/__init__.py", line 154, in validate_records
    for idx, record in enumerate(records):
                       ^^^^^^^^^^^^^^^^^^
  File "/Users/cr/code/augur/augur/curate/transform_strain_name.py", line 72, in run
    transform_name(
  File "/Users/cr/code/augur/augur/curate/transform_strain_name.py", line 21, in transform_name
    if strain_name_pattern.match(record.get("strain", "")) is None:
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: expected string or bytes-like object, got 'NoneType'

[corneliusroemer]

Curate seems to assume that input records don't contain None (i.e. ndjson doesn't have null values).

This should be validated and not just assumed, see 9985588 for a suggestion of how to validate better