Support commands that evaluate to False, like empty dictionaries
Support commands that evaluate to False, like empty dictionaries

AndydeCleyre/plumbum,tomerfiliba/plumbum,siemens/plumbum,henryiii/plumbum,weka-io/plumbum,tigrawap/plumbum,vodik/plumbum,tigrawap/plumbum,AndydeCleyre/plumbum,pombredanne/plumbum,siemens/plumbum,fahhem/plumbum,adamchainz/plumbum,adamchainz/plumbum,henryiii/plumbum,pombredanne/plumbum,astraw38/plumbum,astraw38/plumbum,weka-io/plumbum,tomerfiliba/plumbum,fahhem/plumbum,vodik/plumbum