TypeError when the first node is "decl" type

[erickskrauch]

This condition fails in the case when the first element has the type decl. This is a common situation when the CSS is written in SCSS/LESS.

postcss-bidirection/index.js

Lines 179 to 195 in e150537

	if (item.type === 'rule') {
	tree[idx] = {
	rule: item,
	nodes: [],
	ltrRule: cloneItem(item),
	ltrNodes: [],
	rtlRule: cloneItem(item),
	rtlNodes: [],
	isBiDi: false
	};
	currentIdx = idx;
	idx += 1;
	} else if (item.type === 'decl') {
	tree[currentIdx].nodes.push(item);
	tree[currentIdx].ltrNodes.push(cloneItem(item));
	tree[currentIdx].rtlNodes.push(cloneItem(item));
	}

Can be easily fixed by this condition fix (highlighted part):

But it seems a bit ugly. Will be glad to have more stable and right fix.