Can't run if there is no control

[d-jch]

Description of feature

I know it is recommended that every chip-seq should have an input, but there are also many experiments that choose not to sequence the input.

[JoseEspinosa]

This has been discussed several times see this slack thread of how to run a dataset without controls.

[JoseEspinosa]

Will close it now as it has not activity for a long time.