smallRNA: additional fix for no trim QC
smallRNA: additional fix for no trim QC

Fixes forgotten import in 761257d1442fcac037b851e0859312ba937e7a29
Fixes #2334
Fixes #2335
Fixes #2311

chapmanb/bcbio-nextgen,a113n/bcbio-nextgen,lbeltrame/bcbio-nextgen,vladsaveliev/bcbio-nextgen,a113n/bcbio-nextgen,lbeltrame/bcbio-nextgen,chapmanb/bcbio-nextgen,vladsaveliev/bcbio-nextgen,a113n/bcbio-nextgen,lbeltrame/bcbio-nextgen,vladsaveliev/bcbio-nextgen,chapmanb/bcbio-nextgen