Download cty.plist separately so errors can be better handled

spotproviders/gma.py

@@ -4,6 +4,7 @@ from datetime import datetime, timedelta
 import pytz
 from requests_cache import CachedSession
 
+from core.constants import HTTP_HEADERS
 from data.spot import Spot
 from spotproviders.http_spot_provider import HTTPSpotProvider
 
@@ -43,7 +44,7 @@ class GMA(HTTPSpotProvider):
 
             # GMA doesn't give what programme (SIG) the reference is for until we separately look it up.
             ref_response = self.REF_INFO_CACHE.get(self.REF_INFO_URL_ROOT + source_spot["REF"],
-                                                   headers=self.HTTP_HEADERS)
+                                                   headers=HTTP_HEADERS)
             # Sometimes this is blank, so handle that
             if ref_response.text is not None and ref_response.text != "":
                 ref_info = ref_response.json()