Fix ISBN scraper

media/forms.py

@@ -9,6 +9,7 @@ import unicodedata
 from urllib.error import HTTPError
 import urllib.request
 
+from django.core.exceptions import ValidationError
 from django.db.models import QuerySet
 from django.forms import ModelForm
 from django.utils.translation import gettext_lazy as _
@@ -320,6 +321,13 @@ class MediaAdminForm(ModelForm):
         return self.cleaned_data
 
     def _clean_fields(self):
+        # First clean ISBN field
+        isbn_field = self.fields['isbn']
+        isbn = isbn_field.widget.value_from_datadict(
+            self.data, self.files, self.add_prefix('isbn'))
+        isbn = isbn_field.clean(isbn)
+        self.cleaned_data['isbn'] = isbn
+
         for name, field in self.fields.items():
             # value_from_datadict() gets the data from the data dictionaries.
             # Each widget type knows how to retrieve its own data, because some
@@ -329,7 +337,6 @@ class MediaAdminForm(ModelForm):
             else:
                 value = field.widget.value_from_datadict(
                     self.data, self.files, self.add_prefix(name))
-            from django.core.exceptions import ValidationError
             try:
                 # We don't want to check a field when we enter an ISBN.
                 if "isbn" not in self.data \