number_format dies if value is string/empty/non integer

[johnjamesjacoby]

In a situation where a user has no friends or no groups (woe is me), it's possible the number_format filter will bork the whole thing down.

Suggest maybe using (int) in front of return values, or creating a new function to check for (int) values and then number_format it afterwards.

[apeatling]

(In [2375]) Fixes #1481 - prevent possible number_format() fail. Props jjj