If an attribute is present in DICOM but empty (i.e., Value Length is 0), it shall be preserved in the DICOM JSON attribute object containing no "Value", "BulkDataURI" or "InlineBinary".

If a multi-valued attribute has one or more empty values these are represented as "null" array elements. For example:

"Value": [ "bar", null, "foo" ]

If a sequence contains empty items these are represented as empty JSON object in the array.

"Value": [ { … }, { }, { … } ]