Fix failing recon API test (#976)
Fix failing recon API test (#976)

This PR updates `resolvePlaceIDs()` so that `bulk_find_entities_test.go`
passes.

With this change, descriptions that do not map to any dcids are still
returned, just without matches (e.g. the "non-existing place wow" case
in
[/internal/server/recon/bulk_find_entities_test.go:51](https://github.com/datacommonsorg/mixer/blob/ade6e189a0ff2efb251dd32517208cfe5f73d123/internal/server/recon/golden/bulk_find_entities_test.go#L51)
datacommonsorg/mixer,datacommonsorg/mixer,datacommonsorg/mixer