[support] Entity_metadata_wrapper: Does field have data?

With fields I often do:   if ($vca = field_get_items('node', $node, 'field_corresponding_vca')) { This makes sure there is some data before trying to do anything with it. But I've searched all over the place and even dug into the code. How do you do this with entity_metadata_wrapper? I want to give the users an error message that means something to them, and sometimes just set the value to zero. I see that the Entity module has a protected function called "dataAvailable" but I can't use a protected function.   Nancy Injustice anywhere is a threat to justice everywhere. -- Dr. Martin L. King, Jr.