ios crash with message: "A multipoint must have at least one vertex"

Running the latest from develop branch in an ios emulator I'm seeing this error after authenticating:

```
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'A multipoint must have at least one vertex.'
```

No source file, test, or entry point is named. First reproduce the crash in an iOS emulator after authentication and trace the “A multipoint must have at least one vertex” exception to its origin; done means authentication no longer crashes and the relevant behavior is covered by a regression check.

Written by the indexing model from the issue text.