InterectPSets still doesnt do the right thing on concentrations?

[p-smirnov]

When cell lines and drugs are not both selected in addition to concentrations, the concentrations intersection is skipped it seems. Need to verify.

In addition, intersection small example datasets on concentrations hangs on MacOS

[p-smirnov]

Nevermind, the behavior was chosen by design. However, it needs to be documented, and a warning would be nice.