Fix: getEveryone calls back on error.
Fix: getEveryone calls back on error.

andrewvy/slack-pongbot,garukun/slack-pongbot,jinpark/pongbot-2,andrewvy/slack-pongbot,clementmiao/slack-smashbot,geoffrey/slack-pongbot,geoffrey/slack-pongbot,garukun/slack-pongbot,jinpark/pongbot-2