Popover throws the `Uncaught (in promise)` error when we use the hover trigger with the delay

[stukalin]

Steps

1. Use a popover with the following combination of parameters: @delayShow={{some relatively large number e.g. 1000}} @triggerEvents="hover"
2. Hover over the triggering element and immediately leave before the popover is rendered

Expected result Nothing should happen

Actual result There is the

error in the console

[kdagnan]

Also experiencing this in BsTooltip. Looks like this fix will also fix this issue