Npc race set to empty value

[aaclayton]

Originally in GitLab by @crymic

This is a minor issue but I found an inconsistency between creating an npc and an npc in the srd.

• Srd race on npc is set to null
• Creating an npc sets it to ``

Cause when importing actors in as an npc, the field is empty. This was causing errors in macros for creature type detection if including race with it.

[aaclayton]

Originally in GitLab by @crymic

This issue started in 9.x, in 8.x npcs were generated with race being a null value. Now in 9.x all npcs are generated with an empty string value.