Get rid of unecessary clearTimeout()

[DerZyklop]

I have a webapp with a lot of poppers in a calendar-view. Each calender-event can have its own popper. On logout, the calender gets destroyed and so do all the poppers. Now we get a performance issue, because of a lot of clearTimeout()'s. I found them in ngOnDestroy in popper-directive.ts:

ngx-popper/src/popper-directive.ts

Lines 238 to 239 in 5a8af28

	clearTimeout(this.scheduledShowTimeout);
	clearTimeout(this.scheduledHideTimeout);

We dont have a single popper with a delay - so these clearTimeout()'s are useless for us. My idea: A simple

if (this.scheduledShowTimeout !== undefined) {
  clearTimeout(this.scheduledShowTimeout);
}

instead of

clearTimeout(this.scheduledShowTimeout);

Would fix it, right? But i‘m not sure if this has any side-effects for those who use delay on their poppers.

[tonysamperi]

@DerZyklop did this, if you still need a performance boost! https://tonysamperi.github.io/ngx-popperjs/