Fix unassigned variable in insights

Author: aboudreault

cassandra/datastax/insights/reporter.py

@@ -121,6 +121,7 @@ def _get_startup_data(self):
         try:
             local_ipaddr = cc._connection._socket.getsockname()[0]
         except Exception as e:
+            local_ipaddr = None
             log.debug('Unable to get local socket addr from {}: {}'.format(cc._connection, e))
         hostname = socket.getfqdn()