RSS Feed/News lazy loaded javascript files can have "undefined" in cache buster string

[ENXF NET]

JavaScript:

.map(unloadedHandler =>
{
    const handler = lazyHandlers[unloadedHandler]
    handler.loading = true

const file = handler.minified && !XF.config.fullJs
        ? handler.file.replace('.js', '.min.js')
        : handler.file
    return jsUrl.replace('__SENTINEL__', file) + '_mt=' + XF.config.jsMt[file] || ''
})
.filter((file, index, self) => self.indexOf(file) === index)

The fragment XF.config.jsMt[file] || '' returns undefined not an empty value. This is because || '' binds after the...

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