Alerts user if essential information is missing. Clarified code.
Alerts user if essential information is missing. Clarified code.

sorgerlab/indra,sorgerlab/indra,pvtodorov/indra,johnbachman/indra,johnbachman/belpy,johnbachman/indra,sorgerlab/belpy,sorgerlab/indra,johnbachman/indra,bgyori/indra,bgyori/indra,pvtodorov/indra,johnbachman/belpy,pvtodorov/indra,johnbachman/belpy,bgyori/indra,pvtodorov/indra,sorgerlab/belpy,sorgerlab/belpy