Fix CI bug
Fix CI bug

wordexp function behaves differently in older libc. In new libc (on
ubuntu 16.04) wordexp("", ...) returns empty string which is a desired
behavior. In old libc (on ubuntu 14.04) wordexp("", ...) return error
causing the application to fail.

akumuli/Akumuli,akumuli/Akumuli,akumuli/Akumuli,akumuli/Akumuli