Fixed the progression graph for users with no solves.
Fixed the progression graph for users with no solves.

cganas/picoCTF-web,picoCTF/picoCTF-web,alpire/picoCTF-web,cganas/picoCTF-web,picoCTF/picoCTF-web,cganas/picoCTF-web,picoCTF/picoCTF-web,alpire/picoCTF-web,alpire/picoCTF-web,alpire/picoCTF-web,cganas/picoCTF-web,picoCTF/picoCTF-web