dsb does not run when intersection is False

[JHYSiu]

dsb does not run when half the samples are rna + adt, half the samples are rna only (and no intersection between rna,adt is taken).

fix is to take the intersection of the background: mu.pp.intersect_obs(mdata_bg) prior to mu.prot.pp.dsb

[wlason]

I ran into the same problem in panpipes v0.4.1 and the solution given by @JHYSiu solves the issue.

[wlason]

This is still not fixed as of today @bio-la and I run into the same problem again with another dataset. I will write a fix and create a PR.

[deevdevil88]

@wlason you just need to add an if statement in the preprocess prot script, that when intersect rna,prot is not set, to take the intersect of BG and unfilt mdata obs and then run dsb. Been meaning to add the PR for it as we know the fix but just keep forgetting