Modify get_psu_presence(). Move read() and close() to "try: ... except IOError:" To avoid when read port present sysfs fail. This exception will let sfputil.py to exit. So "sfputil show eeprom" can't show other port status.
Signed-off-by: brandon_chuang <brandon_chuang@CicadaBuildServer.accton.com.tw>
Signed-off-by: brandon_chuang <brandon_chuang@edge-core.com>