WebElement __eq__ compares against more types

Prior to the definition of __ne__, many users
were using != with items without 'id' attr.
These users are broken by the new definition
of __ne__ as __eq__ raises an AttributeError.
Ensure __eq__ returns false when no 'id' attr
is defined.

Signed-off-by: Luke Inman-Semerau <luke.semerau@gmail.com>

py/selenium/webdriver/remote/webelement.py

@@ -426,7 +426,7 @@ def id(self):
         return self._id
 
     def __eq__(self, element):
-        return self._id == element.id
+        return hasattr(element, 'id') and self._id == element.id
 
     def __ne__(self, element):
         return not self.__eq__(element)