Run previous action when failed to read ro.vendor.build.version.sdk

In ag/12214500 isVendorApiLevelNewerThan and
isVendorApiLevelAtLeast in PropertyUtil.java
changed to read ro.vendor.build.version.sdk
and throw exception when failed to read it.
But this change can be problem when run test
on old system image that can't read the
property. In that case, just return the result
of previous logic.

Bug: 166800127
Test: gts-tradefed run gts -m GtsYouTubeTestCases
Change-Id: I633a8d2c82326d2f2e6a873ebfe29f39d1c10ef8
1 file changed