useQuery error is undefined if another useQuery polls changed data

[oleksandrkryvosheiev]

Intended outcome:

Display useQuery error

Actual outcome:

useQuery error is undefined

How to reproduce the issue:

https://github.com/AlexandrKrivosheev/apollo-poll-undefined-error-example

use query X that returns error, use query Y that polls changed data (like current time)
query X error becomes undefined when Y query polled changed data

Version

System:
OS: macOS 10.14.6
Binaries:
Node: 10.15.3 - ~/.nvm/versions/node/v10.15.3/bin/node
Yarn: 1.17.3 - ~/.nvm/versions/node/v10.15.3/bin/yarn
npm: 6.4.1 - ~/.nvm/versions/node/v10.15.3/bin/npm
Browsers:
Chrome: 76.0.3809.100
Safari: 12.1.2
npmPackages:
apollo-cache-inmemory: ^1.6.3 => 1.6.3
apollo-client: ^2.6.4 => 2.6.4
apollo-link-http: ^1.5.5 => 1.5.5
react-apollo: ^3.0.1 => 3.0.1

[hwillson]

This should be fixed by #3419 and is available in React Apollo 3.1.0. Thanks!