Hi Firecloud team
My tool in firecloud can output different kinds of files based on input flags (for example, a matlab compatible file, a pkl, a maf etc)
I would like to specify output files as optional, since they are not always present, but can be and do not want to have a separate wdl per input option....
I use this in firehose and to use my tools in firecloud I need this as well.
-Dimitri
