tree ff6037cdf701a1ef1d16b0bffe7f823ff19d7d4c
parent c363323e7ee9e42817922346b1f1ce6adc872d1b
author Myung Bae <myungbae@us.ibm.com> 1726251799 -0400
committer Myung Bae <myungbae@us.ibm.com> 1726432136 -0400

Return empty paths if no SubTreePathsById is found

`getAssociatedSubTreePaths()` returns the empty paths if there are no
associated subtrees, and bmcweb uses it to differentiate from the error.

However, `getAssociatedSubTreePathsById()` (which is introduced by [1])
returns NotFound error for the case. It would be more appropriate to
match its behavior with `getAssociatedSubTreePaths()`.

Tested:
- unit-test is succeeded for good and bad cases

[1] https://gerrit.openbmc.org/c/openbmc/phosphor-objmgr/+/70699

Change-Id: I84680b1b39ba8ade94ea6fdb7dae280505e5c050
Signed-off-by: Myung Bae <myungbae@us.ibm.com>