fixes showModal() to work with scrolling="no" panels showModal() could show "undefined" instead of content for panels where scrolling was "disabled" (scrolling="no" attribute), if ...childNodes[0] was "undefined".
fixes showModal() to work with scrolling="no" panels
showModal() could show "undefined" instead of content for panels where scrolling was "disabled" (scrolling="no" attribute), if ...childNodes[0] was "undefined".

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