fix: create modal manager, for Popover, on demand as a singleton #859
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Description
When a script tag containing fundamental react was included in the
<head>of the document it was throwing an error.It looks like this was happening because the version of react-overlays that fundamental-react is using in the Popover depends on
document.body.appendChildto calculate the scrollbar width from the ModalManager's constructor.This change ensures that the calculation for
document.body.appendChildwill only happen when it is available.