Improve validity check for IIIFCommand
Improve validity check for IIIFCommand

uoregon-libraries/newspaper-jp2-viewer,uoregon-libraries/newspaper-jp2-viewer,uoregon-libraries/rais-image-server,uoregon-libraries/rais-image-server,uoregon-libraries/rais-image-server,uoregon-libraries/newspaper-jp2-viewer,uoregon-libraries/rais-image-server