Only copy launcher html pages if they exist.
Only copy launcher html pages if they exist.

- Fixes build being broken if --disable-doc is used.

Change-Id: Ia53d90b80d114c360fcc0956f470c66d4a8d2f70
Signed-off-by: Brad Geltz <e42f3ad4099980ea02f08e076efbee5cf9d4a803@intel.com>

geopm/geopm,cmcantalupo/geopm,cmcantalupo/geopm,geopm/geopm,geopm/geopm,geopm/geopm,cmcantalupo/geopm,cmcantalupo/geopm,geopm/geopm,cmcantalupo/geopm