fixed corner case [1,1].lcmByFactors

[chris75vie]

I'd expect that following lines result the same value

[1,1].reduce(\lcm);
[1,1].lcmByFactors[1];

Actually an empty list is returned in this case.
Probably there's a more elegant way to implement this behaviour.

[dkmayer]

Hi, thanks for the hint !
I'll add in the next offical version (which might take time).