Fix adb shell cmd activity get-config --proto --device fail

Root cause:
If the system features got from pm.getSystemAvailableFeatures() have some features with no name,
it may cause adb shell cmd activity get-config --proto --device fails, the second parameter
in the compator should also be judged with o2.name == null

Bug: 118662777

Test: run cts  -m CtsActivityManagerDeviceTestCases
               -t android.server.am.ActivityManagerGetConfigTests#testDeviceConfig


Change-Id: Iee22cdf2e69104d3d9480971655b0be66ff84e46
Signed-off-by: weijuncheng <weijuncheng@xiaomi.com>