ImportKey error during keybase pgp select

During keybase pgp select the following fatal error is encountered:

ImportKey error: openpgp: invalid data: entity without any identities

```
$ keybase pgp select abc123abc123abc123abc123abc123abc123
# Algo Key Id Created UserId
= ==== ====== ======= ======
1 4096R ABC123BABC123 ...
Choose a key: ABC123BABC123
Choose a key (1-1, or q to cancel): 1
▶ ERROR ImportKey error: openpgp: invalid data: entity without any identities

$ keybase version
Client: 1.0.9-0
Service: 1.0.9-0
```

Reproduce the failure with the shown keybase pgp select command and compare behavior with the reported Keybase 1.0.9-0 versions. Trace the ImportKey error from the select flow to identify the affected entry point; done means selecting the displayed key no longer fails with an entity-without-identities error.

Written by the indexing model from the issue text.