Do not register lift when sensor is not present

Bug: 141284056
Fixes: 142365481
Test: force snesor to return null
Change-Id: I45583e4f1c06ec7088a7d6335597a8671555f339
(cherry picked from commit 3b745ddf4a0105ee01b42f5024be4e0370a89b6b)
(cherry picked from commit 0a410d3a6c4d7cff0d617e501ecc14e61219a358)
1 file changed