tree a271ee79ace0bfdb325dfd6f507ff9177fc1badf
parent 2a1ef0138c33036c82793104287e72d41f778108
author Myung Bae <myungbae@us.ibm.com> 1742916802 -0700
committer Myung Bae <myungbae@us.ibm.com> 1743510665 -0500

Fix SubTreePathsById when given ID is invalid

The commit 7a93d51 makes `getAssociatedSubTreePathsById()` to return
empty paths if there are no associated subtrees.  However, it also
returns empty paths as a success, even if the given id is not valid.

This is to check the invalid case and to return NotFound.

For example, currently, this gives the success
- GET /redfish/v1/Chassis/INVALID/PowerSubsystem/PowerSupplies

Tested:
- GET with the invalid id and check the return condition.

```
busctl call -j  "xyz.openbmc_project.ObjectMapper"   "/xyz/openbmc_project/object_mapper" \
  "xyz.openbmc_project.ObjectMapper" "GetAssociatedSubTreePathsById" ssassas \
   "InvalidChassis" \
   "/xyz/openbmc_project/inventory"  \
   1 "xyz.openbmc_project.Inventory.Item.Chassis" \
    "powered_by" \
   1  "xyz.openbmc_project.Inventory.Item.PowerSupply"

-->
Call failed: The resource is not found.
```

Change-Id: If4f621e105bc1a5c443c1ec8b7762f57748e1d10
Signed-off-by: Myung Bae <myungbae@us.ibm.com>