This patch prevents a Null Pointer Exception in
queryMoistureDetectionStatus() when getPortStatusHelper() fails to open
the /sys/class/typec file. The failure results in an empty
currentPortStatus vector, causing the NPE when accessing its first
element.
Bug: 361097811
Flag: EXEMPT bugfix
Test: NPE does not occur when getPortStatusHelper() fails
Change-Id: I61c9f7647aafca28b777e53f170764ddd02c060f
Signed-off-by: Kuen-Han Tsai <khtsai@google.com>
f22f21191b