Fix array index out of bounds on enter key event

[dreamofabear]

On keyboard enter, don't select when filteredItems is empty.

If filteredItems is empty array here:

tribute/src/TributeEvents.js

Lines 226 to 230 in 252ec34

	if (this.tribute.isActive && this.tribute.current.filteredItems) {
	e.preventDefault();
	e.stopPropagation();
	setTimeout(() => {
	this.tribute.selectItemAtIndex(this.tribute.menuSelected, e);

Then item will be undefined here:

tribute/src/Tribute.js

Lines 473 to 479 in 252ec34

	selectItemAtIndex(index, originalEvent) {
	index = parseInt(index);
	if (typeof index !== "number" || isNaN(index)) return;
	let item = this.current.filteredItems[index];
	let content = this.current.collection.selectTemplate(item);
	if (content !== null) this.replaceText(content, originalEvent, item);
	}

I noticed this when hitting the enter key on strings that don't match any values but coincidentally contain my trigger character, e.g. : in hyperlinks.