Fix IE8 and IE9 with base64 polyfill issue #1300
Merged
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When you use base64 and excanvas polyfills for IE8/IE9 I get this error:
It happens because the
isResizeSupported
function returns success, and it happens because of the polyfills, but later on you usewindow.Blob.prototype
andBlob
is undefined.My fix just adds a better validation.