Bug in legacy loader

[mackonen]

Currently the loader checks for existing script on page with

// If already included in the page:
 if (window.google!== undefined) {
    return Promise.resolve(window.google.charts);
}

unfortunately this doesn't work if you have used other google scripts on the page that are using the google namespace...

this should be instead:

// If already included in the page:
 if (window.google.charts !== undefined) {
    return Promise.resolve(window.google.charts);
}

[mackonen]

And short term I'd be open to any ideas how to bypass that bug as we are using other google components.. have been trying to figure out how to override / bypass this issue.