handle undefined mobile commons data

[itsjoekent]

2015-03-26T19:32:54.319062+00:00 app[web.1]: throw er; // Unhandled 'error' event 2015-03-26T19:32:54.319124+00:00 app[web.1]: ^ 2015-03-26T19:32:54.321512+00:00 app[web.1]: TypeError: Cannot read property 'first_name' of undefined 2015-03-26T19:32:54.321515+00:00 app[web.1]: at /app/modules/events.js:23:41 2015-03-26T19:32:54.321517+00:00 app[web.1]: at Array.forEach (native) 2015-03-26T19:32:54.321518+00:00 app[web.1]: at /app/modules/events.js:22:14 2015-03-26T19:32:54.321520+00:00 app[web.1]: at /app/services/mobile_commons.js:30:9 2015-03-26T19:32:54.321522+00:00 app[web.1]: at Parser. (/app/node_modules/xml2js/lib/xml2js.js:428:18) 2015-03-26T19:32:54.321523+00:00 app[web.1]: at Parser.emit (events.js:95:17) 2015-03-26T19:32:54.321525+00:00 app[web.1]: at Object.onclosetag (/app/node_modules/xml2js/lib/xml2js.js:397:26) 2015-03-26T19:32:54.321527+00:00 app[web.1]: at emit (/app/node_modules/xml2js/node_modules/sax/lib/sax.js:615:33) 2015-03-26T19:32:54.321528+00:00 app[web.1]: at emitNode (/app/node_modules/xml2js/node_modules/sax/lib/sax.js:620:3) 2015-03-26T19:32:54.321530+00:00 app[web.1]: at closeTag (/app/node_modules/xml2js/node_modules/sax/lib/sax.js:861:5) 2015-03-26T19:32:54.321531+00:00 app[web.1]: at Object.write (/app/node_modules/xml2js/node_modules/sax/lib/sax.js:1294:29) 2015-03-26T19:32:54.318815+00:00 app[web.1]: events.js:72 2015-03-26T19:32:55.158397+00:00 heroku[web.1]: Process exited with status 8