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Crash on unexpected properties #398

@stszap

Description

@stszap

Hello, we use juice to parse incoming emails and recently we got an email that causes juice to crash without any chance to catch the error. We narrowed it down to a simple example that gives the following error:

(node:53511) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'match' of undefined
    at addProps (/private/tmp/node_modules/juice/lib/inline.js:205:35)
    at Element.<anonymous> (/private/tmp/node_modules/juice/lib/inline.js:231:7)
    at LoadedCheerio.each (/private/tmp/node_modules/cheerio/lib/api/traversing.js:480:26)
    at handleRule (/private/tmp/node_modules/juice/lib/inline.js:120:9)
    at Array.forEach (<anonymous>)
    at inlineDocument (/private/tmp/node_modules/juice/lib/inline.js:36:9)
    at juiceDocument (/private/tmp/node_modules/juice/lib/inline.js:459:3)
    at module.exports (/private/tmp/node_modules/juice/lib/cheerio.js:61:22)
    at onInline (/private/tmp/node_modules/juice/index.js:75:7)
    at /private/tmp/node_modules/web-resource-inliner/src/html.js:281:13

The callback is never called and try/catch can't catch the error either. The code to reproduce:

const juice = require('juice')

function main() {
    const input = `<html>
    <head>
        <style type="text/css">
            .logo img {
                .snippet {
                    padding: 20px 0px 5px 0px;
                    font-size: 0;
                    line-height: 0;
                }
        </style>
    </head>
    <body>
        <div class="logo">
            <img src="https://example.com" />
        </div>
    </body>
    </html>`

    try {
        juice.juiceResources(
            input,
            {
                webResources: {
                    scripts: false,
                    images: false,
                    svgs: false,
                    links: true,
                },
            },
            async (err, html) => {
                console.log(`juice results: ${err}, ${html} `)
            },
        );
    } catch (err) {
        console.log(`trycatch error: ${err}`)
    }
}

main()

node: v14.18.1
juice: 8.0.0

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