fix: source distribution with prebuild js should skip js_command
fix: source distribution with prebuild js should skip js_command

SylvainCorlay/bqplot,bloomberg/bqplot,bloomberg/bqplot,ChakriCherukuri/bqplot,SylvainCorlay/bqplot,bloomberg/bqplot,ChakriCherukuri/bqplot,ChakriCherukuri/bqplot,SylvainCorlay/bqplot