dnvm list outputs "find: `/usr/local/lib/dnx/runtimes': No such file or directory"

[bjorkstromm]

After global install was added, dnvm list now outputs the message "find: `/usr/local/lib/dnx/runtimes': No such file or directory".

This error message is seen everytime I open up the terminal, since sourcing dnvm.sh automatically runs dnvm list and dnvm use

dnvm list should check if directory exist before executing find.

[bjorkstromm]

Btw, why is dnvm list default executed while sourcing dnvm.sh? I mean default isn't even a valid parameter for dnvm list.
//cc @BrennanConroy @anurse