Handle throw with no arguments in no-throw-literal

[steelbrain]

Prerequisites checklist

• I have read the contributing guidelines.
• The team has reached consensus on the changes proposed in this pull request. If not, I understand that the evaluation process will begin with this pull request and won't be merged until the team has reached consensus.

What is the purpose of this pull request?

[ ] Documentation update
[x] Bug fix (template)

Repro for the bug

throw

Yep, that's it. Empty file with that will crash ESLint.

Here's the stack trace from ESLint output channel in VSCode

[Error - 1:41:32 PM] TypeError: Cannot read property 'type' of null
Occurred while linting [fileName].ts:132
    at Object.couldBeError (eslint/lib/rules/utils/ast-utils.js:1262:22)
    at ThrowStatement (eslint/lib/rules/no-throw-literal.js:38:31)
    at eslint/lib/linter/safe-emitter.js:45:58
    at Array.forEach (<anonymous>)
    at Object.emit (eslint/lib/linter/safe-emitter.js:45:38)
    at NodeEventGenerator.applySelector (eslint/lib/linter/node-event-generator.js:254:26)
    at NodeEventGenerator.applySelectors (eslint/lib/linter/node-event-generator.js:283:22)
    at NodeEventGenerator.enterNode (eslint/lib/linter/node-event-generator.js:297:14)
    at CodePathAnalyzer.enterNode (eslint/lib/linter/code-path-analysis/code-path-analyzer.js:634:23)
    at eslint/lib/linter/linter.js:936:32

I'm using the @typescript-eslint parser if that's relevant.

[jsf-clabot]

All committers have signed the CLA.

[mdjermanovic]

Thanks for the PR!

However, I don't think we should change the code to support node.argument === null because it is expected to be a parsing error, like in this demo with the default parser.

throw without argument is invalid syntax by The throw Statement specification. Rules and helper functions usually don't account for invalid syntax.

In my opinion, this should be fixed in @typescript-eslint/parser.

[steelbrain]

Very well, thank you. I'll x-post this to the parser

Edit: Opened typescript-eslint/typescript-eslint#1852