Made Users.isCustomIcon() more defensive
Made Users.isCustomIcon() more defensive

EGreg/Platform,Qbix/Platform,EGreg/Platform,EGreg/Platform,AndreyTepaykin/Platform,AndreyTepaykin/Platform,Qbix/Platform,EGreg/Platform,AndreyTepaykin/Platform,Qbix/Platform,Qbix/Platform,AndreyTepaykin/Platform