old_contents: import sys
  from django.core.management.base import BaseCommand
  from ... import models
  from ...ocr import walk
  
  class Command(BaseCommand):
  
      help = "Ingest OCRed files"
  
      def add_arguments(self, parser):
          parser.add_argument(
              'collection_slug',
              default=None,
              help="The slug of the collection"
          )
          parser.add_argument(
              'tag',
              default=None,
              help="The key of the OCR file set"
          )
  
      def handle(self, verbosity, collection_slug, tag, **options):
          try:
              c = models.Collection.objects.get(slug=collection_slug)
          except models.Collection.DoesNotExist:
              print("Collection with slug", collection_slug, "does not exist.")
              sys.exit(1)
          if tag not in c.ocr:
              print("Collection with slug", collection_slug, "does not have OCR key", tag)
              sys.exit(1)
          ocr_path = c.ocr[tag]
          walk(c, tag, ocr_path, verbose=verbosity > 0)
  
new_contents: import sys
  from django.core.management.base import BaseCommand
  from ... import models
  from ...ocr import walk
  
  class Command(BaseCommand):
  
      help = "Ingest OCRed files"
  
      def add_arguments(self, parser):
          parser.add_argument(
              'collection_slug',
              help="The slug of the collection"
          )
          parser.add_argument(
              'tag',
              help="The key of the OCR file set"
          )
  
      def handle(self, verbosity, collection_slug, tag, **options):
          try:
              c = models.Collection.objects.get(slug=collection_slug)
          except models.Collection.DoesNotExist:
              print("Collection with slug", collection_slug, "does not exist.")
              sys.exit(1)
          if tag not in c.ocr:
              print("Collection with slug", collection_slug, "does not have OCR key", tag)
              sys.exit(1)
          ocr_path = c.ocr[tag]
          walk(c, tag, ocr_path, verbose=verbosity > 0)
  
subject: remove default fallbacks for walkocr