Allow task for PendingScrapingResponse to be null

restscrape/models.py

@@ -134,7 +134,9 @@ class ScrapingResponse(models.Model):
 
 
 class PendingScrapingResponse(ScrapingResponse):
-    task = models.ForeignKey(PageRequestTask, on_delete=models.CASCADE)
+    task = models.ForeignKey(
+        PageRequestTask, on_delete=models.CASCADE, blank=True, null=True
+    )
     request = models.ForeignKey(ScrapeRequest, on_delete=models.CASCADE)
 
     def mark_complete(self, xpath_labels):