LSG: Allow running make kss without npm installed, if kss is

Followup to similar patch in core:
I561b365d4aaf44d921fb54a020e9ff6319318063

This should allow the Tool Labs cronjob to run without errors
(Tool Labs execution nodes do not have npm installed, but it will
work if kss is pre-installed).

Change-Id: I419052c97f8a755640a2b65ccef64f2621a19e13
Merge "LSG: Allow running make kss without npm installed, if kss is"