Add fallback for volume name

arkindex/documents/importer.py

@@ -166,18 +166,23 @@ class ManifestsImporter(ABC):
     def parse_manifest(self, stream):
         """Parse a IIIF manifest loaded as a stream."""
         # Get this file's volume range ID from the top-most structure
-        range_id = next(struct['ranges'][0]
-                        for struct in ijson.items(stream, "structures.item")
-                        if struct.get('viewingHint') == "top")
-        stream.seek(0)
-
-        # Get our volume's structure and label
-        vol_struct = next(struct for struct in ijson.items(stream, "structures.item")
-                          if struct.get('@id') == range_id)
-        vol_name = vol_struct['label']
-        logger.debug("Creating volume {}".format(vol_name))
+        try:
+            range_id = next(struct['ranges'][0]
+                            for struct in ijson.items(stream, "structures.item")
+                            if struct.get('viewingHint') == "top")
+            stream.seek(0)
+
+            # Get our volume's structure and label
+            vol_struct = next(struct for struct in ijson.items(stream, "structures.item")
+                              if struct.get('@id') == range_id)
+            vol_name = vol_struct['label']
+        except StopIteration:
+            logger.debug("Invalid structures in manifest - using manifest label as volume name")
+            stream.seek(0)
+            vol_name = next(ijson.items(stream, 'label'))
 
         # Create a volume and a register
+        logger.debug("Creating volume {}".format(vol_name))
         vol, _ = Element.objects.get_or_create(name=vol_name, type=ElementType.Volume)
         doc, _ = Element.objects.get_or_create(name=vol_name, type=ElementType.Register)
         ElementLink.objects.get_or_create(parent=vol, child=doc)