Set actor.name to empty string if alternatename is null

Author: savvan0h

xapi_stmt_gen/Dockerfile

@@ -1,6 +1,6 @@
 FROM node:12.22.0
 
-LABEL version="2.9.0"
+LABEL version="2.9.1"
 
 WORKDIR /usr/local/src
 RUN mkdir xapi_stmt_gen

xapi_stmt_gen/xapi_stmt_gen/generator.js

@@ -3734,7 +3734,7 @@ module.exports = async function main() { // eslint-disable-line max-statements
     if (eppn) {
       userAttrs[user.id] = eppn;
     } else {
-      const hash = crypto.createHash('sha256').update(username).digest('hex');
+      const hash = username ? crypto.createHash('sha256').update(username).digest('hex') : '';
       const scope = getScopeFromEppn(username);
       userAttrs[user.id] = {
         username: username, // may not be ePPN format