Allow to force glob: ${ return [];} for output type: ["null", File] to be null;
Allow to force glob: ${ return [];} for output type: ["null", File] to be null;

jeremiahsavage/cwltool,dleehr/cwltool,jeremiahsavage/cwltool,dleehr/cwltool,chapmanb/cwltool,SciDAP/cwltool,common-workflow-language/cwltool,jeremiahsavage/cwltool,dleehr/cwltool,chapmanb/cwltool,dleehr/cwltool,jeremiahsavage/cwltool,SciDAP/cwltool,SciDAP/cwltool,common-workflow-language/cwltool,SciDAP/cwltool,common-workflow-language/cwltool,chapmanb/cwltool,chapmanb/cwltool