Fix null pointer if key from popusers exits cache
Fix null pointer if key from popusers exits cache

This is bound to be buggy because all the keys
could leave memcache before popusers does.
routes.go#62 could cause an infinite loop if all
keys are exhausted.

Just needed something that works in production
because 3am on a school night and I'll fix it
all in the upcoming refactor.

AustinDizzy/davine,AustinDizzy/davine,AustinDizzy/davine