fixed kernel bug building js files each time
fixed kernel bug building js files each time

lino-framework/lino,khchine5/lino,lino-framework/lino,khchine5/lino,lsaffre/lino,lsaffre/lino,khchine5/lino,lsaffre/lino,lino-framework/lino,lino-framework/lino,khchine5/lino,lino-framework/lino,khchine5/lino,lsaffre/lino,lsaffre/lino