MediaUsage.fromJson constructor
Lenient, because it also reads the referrers inside an error body.
Implementation
factory MediaUsage.fromJson(Map<String, Object?> json) => MediaUsage(
json['media_id'] as String? ?? '',
json['project'] as String? ?? '',
json['env'] as String? ?? '',
json['collection'] as String? ?? '',
json['entry_id'] as String? ?? '',
);