fix: cloneObject when window.jQuery set but null/undefined
#2029
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I encountered a problem when testing locally with

intro.jswhereby (for some reason)window.jQuerywas set on my browser toundefined. This causes an exception in cloneObject as it tries to use the value for an instance of comparison.My app doesn't use jQuery, so not sure where it is coming from, but either way I think we need to assert that window.jQuery is non-nullable before continuing to the
instanceof.I only encountered this problem when defining the
stepsoption, ascloneObjectis used to clone the input.