Fixing non-null error, even though it should be allowed

parsers/caves.py

@@ -149,9 +149,11 @@ def readcaves():
 
     with transaction.atomic():
         print(" - Deleting Caves and Entrances")
+        Area.objects.all().delete()
         Cave.objects.all().delete()
         Entrance.objects.all().delete()
         # Clear the cave data issues and the caves as we are reloading
+        DataIssue.objects.filter(parser='areas').delete()
         DataIssue.objects.filter(parser='caves').delete()
         DataIssue.objects.filter(parser='caves ok').delete()
         DataIssue.objects.filter(parser='entrances').delete()