Stack trace on opening GitHub tab

[smashwilson]

Prerequisites

• Have you tried to reproduce the problem in Safe Mode?
• Have you followed all applicable steps in the debugging guide?
• Have you checked the FAQs on the message board for common solutions?
• Have you checked that your issue isn't already filed?

Description

When attempting to open the GitHub tab on atom/find-and-replace, I'm seeing a stacktrace in the dev console.

Steps to Reproduce

1. Clone atom/find-and-replace and open it in Atom.
2. Click the GitHub status bar tile to open the GitHub tab.

Expected behavior:

The GitHub tab should open and a list of open pull requests should appear.

Actual behavior:

The following stacktrace appears in the dev console:

/Users/smashwilson/.atom/packages/github/node_modules/react-dom/cjs/react-dom.production.min.js:179 TypeError: Cannot read property 'login' of null
    at new Issueish (issueish.js? [sm]:2)
    at issueishes.props.results.map.node (issueish-list-controller.js? [sm]:15)
    at Array.map (<anonymous>)
    at getDerivedStateFromProps (issueish-list-controller.js? [sm]:15)
    at Qf (/Users/smashwilson/.atom/packages/github/node_modules/react-dom/cjs/react-dom.production.min.js:133)
    at $f (/Users/smashwilson/.atom/packages/github/node_modules/react-dom/cjs/react-dom.production.min.js:138)
    at wg (/Users/smashwilson/.atom/packages/github/node_modules/react-dom/cjs/react-dom.production.min.js:157)
    at Ag (/Users/smashwilson/.atom/packages/github/node_modules/react-dom/cjs/react-dom.production.min.js:169)
    at lh (/Users/smashwilson/.atom/packages/github/node_modules/react-dom/cjs/react-dom.production.min.js:204)
    at mh (/Users/smashwilson/.atom/packages/github/node_modules/react-dom/cjs/react-dom.production.min.js:205)
    at Ph (/Users/smashwilson/.atom/packages/github/node_modules/react-dom/cjs/react-dom.production.min.js:220)
    at Qh (/Users/smashwilson/.atom/packages/github/node_modules/react-dom/cjs/react-dom.production.min.js:219)
    at sh (/Users/smashwilson/.atom/packages/github/node_modules/react-dom/cjs/react-dom.production.min.js:216)
    at Uf (/Users/smashwilson/.atom/packages/github/node_modules/react-dom/cjs/react-dom.production.min.js:214)
    at Object.enqueueSetState (/Users/smashwilson/.atom/packages/github/node_modules/react-dom/cjs/react-dom.production.min.js:134)
    at ReactRelayQueryRenderer.G.setState (/Users/smashwilson/.atom/packages/github/node_modules/react/cjs/react.production.min.js:13)
    at retryCallbacks.handleDataChange (/Users/smashwilson/.atom/packages/github/node_modules/react-relay/lib/ReactRelayQueryRenderer.js:149)
    at /Users/smashwilson/.atom/packages/github/node_modules/react-relay/lib/ReactRelayQueryFetcher.js:291
    at Array.forEach (<anonymous>)
    at ReactRelayQueryFetcher._onQueryDataAvailable (/Users/smashwilson/.atom/packages/github/node_modules/react-relay/lib/ReactRelayQueryFetcher.js:290)
    at Object.next (/Users/smashwilson/.atom/packages/github/node_modules/react-relay/lib/ReactRelayQueryFetcher.js:157)
    at Object.next (/Users/smashwilson/.atom/packages/github/node_modules/relay-runtime/lib/RelayObservable.js:560)
    at Object.next (/Users/smashwilson/.atom/packages/github/node_modules/relay-runtime/lib/RelayObservable.js:560)
    at Object.next (/Users/smashwilson/.atom/packages/github/node_modules/relay-runtime/lib/RelayObservable.js:226)
    at Object.next (/Users/smashwilson/.atom/packages/github/node_modules/relay-runtime/lib/RelayObservable.js:560)
    at Object.next (/Users/smashwilson/.atom/packages/github/node_modules/relay-runtime/lib/RelayObservable.js:560)
    at /Users/smashwilson/.atom/packages/github/node_modules/relay-runtime/lib/RelayObservable.js:491
    at _subscribe (/Users/smashwilson/.atom/packages/github/node_modules/relay-runtime/lib/RelayObservable.js:608)
    at RelayObservable.subscribe (/Users/smashwilson/.atom/packages/github/node_modules/relay-runtime/lib/RelayObservable.js:314)
    at Object.next (/Users/smashwilson/.atom/packages/github/node_modules/relay-runtime/lib/RelayObservable.js:375)

Reproduces how often:

100%

Versions

github@0.24.0 (atom/github#b5091255)

Additional Information

I'm guessing that we're assuming login is a required property in the GraphQL schema when it is not. I suspect the problem is this PR opened by a now-deleted user account:

[neel1998]

I would like to contribute. Can you help me how should i start?