Revert "Add an extra assert which makes sure optimization is correct"

This reverts commit 306bfb5.

Author: lopuhin

extruct/w3cmicrodata.py

@@ -65,18 +65,14 @@ def __init__(self, nested=True, strict=False, add_text_content=False, add_html_n
 
     def get_docid(self, node, itemids):
         try:
-            itemid = itemids[node]  # same as self.get_docid(node, {})
+            return itemids[node]  # same as self.get_docid(node, {})
         except KeyError:
             # Even after itemids are built,
             # this might fail if extract_items is called on a part of the document,
             # and then properties reference some node which is not in itemids,
             # although this does not look likely in practice,
             # so not a performance concern.
             return int(self._xp_item_docid(node))
-        else:
-            # will be removed, this is to make sure optimization is correct
-            assert itemid == self.get_docid(node, {})
-            return itemid
 
     def extract(self, htmlstring, base_url=None, encoding="UTF-8"):
         tree = parse_html(htmlstring, encoding=encoding)