Avoid panicing when closing places db.

[thomcc]

This also has the iOS-relevant portion of #1239, since we're cutting this release for iOS and they're seeing a lot of errors that they can't distinguish between network and interruption.

Pull Request checklist

• Quality: This PR builds and tests run cleanly
  • cargo test --all produces no test failures
  • cargo clippy --all --all-targets --all-features runs without emitting any warnings
  • cargo fmt does not produce any changes to the code
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  • swiftformat --swiftversion 4 megazords components/*/ios && swiftlint runs without emitting any warnings or producing changes
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[vladikoff]

lgtm!