Fixing check for the length of response:

1. If it is list - just check len
2. If there is a key - check that the key length is less then the batch.

gallery_dl/extractor/kemonoparty.py

@@ -568,14 +568,19 @@ def _call(self, endpoint, params=None):
         response = self.extractor.request(url, params=params)
         return response.json()
 
-    def _pagination(self, endpoint, params, batch=50, key=None):
+    def _pagination(self, endpoint, params, batch=50, key=False):
         offset = text.parse_int(params.get("o"))
         params["o"] = offset - offset % batch
 
         while True:
             data = self._call(endpoint, params)
-            yield from data.get(key, data)
-            if len(data.get(key, data)) < batch:
-                return
+            if key:
+                yield from data.get(key)
+                if len(data.get(key)) < batch:
+                    return
+            else:
+                yield from data
+                if len(data) < batch:
+                    return
 
             params["o"] += batch