Fix unified a/b zip generation failure

If vendor model props are blacklisted, a/b zips fail to generate.
This uses a non-partition specific prop if the partition specific
variant does not exist.

Change-Id: I96f583ceb3ccebee21211b964e2ea66217ffd41f
Signed-off-by: RITEFANG <1721985272@qq.com>

tools/releasetools/ota_utils.py

@@ -223,9 +223,13 @@ def UpdateDeviceState(device_state, build_info, boot_variable_values,
       partition_devices = set()
       partition_fingerprints = set()
       for runtime_build_info in build_info_set:
+        try:
             partition_devices.add(
                 runtime_build_info.GetPartitionBuildProp('ro.product.device',
                                                          partition))
+        except common.ExternalError:
+            partition_devices.add(
+                runtime_build_info.GetBuildProp('ro.product.device'))
         partition_fingerprints.add(
             runtime_build_info.GetPartitionFingerprint(partition))