Stop throwing IllegalStateException when isolated-owner mapping is missing

In certain circumstances, an isolated uid could potentially not have an owner due to race conditions in updating the map. Rather than crash the system server, log a wtf error and continue.

Bug: 414985465
Bug: 286903116
Flag: EXEMPT bugfix
Change-Id: I565b9db5c56d5ad9abc8b0826bfc363e1a06bb7d