entity_metadata_wrapper() is an extremely helpful helper :)
Anyway today I found out something dangerous:
Be careful with constructs like this:
$term = taxonomy_term_load($tid);
$term_wrapper = entity_metadata_wrapper('taxonomy_term', $term);
?>
IF the $term does NOT EXISTS here (for example not yet created), taxonomy_term_load() will return FALSE, which is absolutely correct!
Anyway entity_metadata_wrapper() can NOT handle this FALSE value which leads to mysterious Exceptions like:
EntityMetadataWrapperException: Invalid data value given. Be sure it matches the required data type and format. in EntityDrupalWrapper->set()...
later on!
So better check the $term value before you provide it to entity_metadata_wrapper:
$term = taxonomy_term_load($tid);
if ($term !== FALSE) {
$term_wrapper = entity_metadata_wrapper('taxonomy_term', $term);
?>
