Non wrapped entity passed to Rules

Problem/Motivation

I added a rule to handle the rules event After updating an entity translation. The rule uses the condition Entity is of type, unfortunately a call to it ends with an exception:
Fatal error: Call to undefined method stdClass::type() in modules/rules/modules/entity.eval.inc on line 158
Debugging it revealed that the function to check the entity type (rules_condition_entity_is_of_type()) expects an entity wrapped by entity_metadata_wrapper().
The reason for this is that entity translation defines entity as variable type. Rules can't wrap the entity itself because it doesn't know the entity-type.
Btw. I've clarified this with fago in IRC.

Proposed resolution

To maintain the existing API I suggest to use module_invoke_all() to call the module hooks with the unwrapped entity and a separated call to rules_invoke_event() and pass an wrapped entity there.

Remaining tasks

Needs review.

User interface changes

None.

API changes

None.