Don't shift undefined into the actions list if the queue is empty
#14130
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Addresses
TypeError: undefined is not an object (evaluating 'e.blockId')on New Relic. The error occurs only on touch devices. I repro'd on iPhone by pressing "Step" twice in a row. https://rpm.newrelic.com/accounts/501463/browser/3787364/js_errors#id=2099206246Root cause is that iOS Safari doesn't respect
disabledon HTML button elements. This meansgetActionsis called whenthis.steps_is empty for the ExecutionInfo instance. As a result,this.steps_.shift()returns undefined, which is then pushed into theactionsarray.