Fix filter of undefined

[dustinyoste]

Cause of error:

<View 
  prop={ ' ' }
/>

TypeError: Cannot read property 'filter' of undefined
Occurred while linting <file>.js:346
    at hasAdjacentJsx (.../node_modules/eslint-plugin-react/lib/rules/jsx-curly-brace-presence.js:244:59)
    at shouldCheckForUnnecessaryCurly (.../node_modules/eslint-plugin-react/lib/rules/jsx-curly-brace-presence.js:272:49)
    at JSXExpressionContainer (.../node_modules/eslint-plugin-react/lib/rules/jsx-curly-brace-presence.js:304:13)
    at listeners.(anonymous function).forEach.listener (.../node_modules/eslint/lib/linter/safe-emitter.js:45:58)
    at Array.forEach (<anonymous>)
    at Object.emit (.../node_modules/eslint/lib/linter/safe-emitter.js:45:38)
    at NodeEventGenerator.applySelector (.../node_modules/eslint/lib/linter/node-event-generator.js:253:26)
    at NodeEventGenerator.applySelectors (.../node_modules/eslint/lib/linter/node-event-generator.js:282:22)
    at NodeEventGenerator.enterNode (.../node_modules/eslint/lib/linter/node-event-generator.js:296:14)
    at CodePathAnalyzer.enterNode (.../node_modules/eslint/lib/linter/code-path-analysis/code-path-analyzer.js:646:23)

[ljharb]

Thanks! Can you please provide a regression test?

[dustinyoste]

@ljharb I'm having trouble reproducing the crash via a test rule 😅
I have my project set up with these rules:
"react/jsx-curly-brace-presence": [1, { "children": "never", "props": "always" }],

I'm not actually sure why children is undefined in my fix tbh.

[ljharb]

Perhaps something in your eslint config? Are you using a parser that's not the default, like babel-eslint?

[dustinyoste]

@ljharb yeah, I'm using babel-eslint as the parser

    'extends': 'airbnb',
    'parser': 'babel-eslint',
    'env': {
        'jest': true,
    },

I'll dig around and see if the problem is rooted there.

[dustinyoste]

@ljharb regression test added!