fixed problem where threat actors in the top level tables were not printing out their titles even when they had one
fixed problem where threat actors in the top level tables were not printing out their titles even when they had one

this fixes #5

STIXProject/stix-to-html,STIXProject/stix-to-html,STIXProject/stix-to-html,empereor/cvrf-to-html,STIXProject/stix-to-html,empereor/cvrf-to-html,empereor/cvrf-to-html,empereor/cvrf-to-html