modified _filter_token in sams_proxy to fix issue #38

sams_classes/sams_proxy.py

@@ -60,6 +60,8 @@ class SAMSProxy:
     return filteredSession
   
   def _filter_token(self, paramType: str) -> dict:
+    if session == {}:
+      return {}
     if paramType == self._proxySpec.get('token', {}).get('param-type'):
       return {
         self._proxySpec['token']['name']: self._proxySpec['token']['value']}