MODE-2275 Fixed Schemata caching by the JcrNodeTypeManager, which caused newly registered node types to not be visible as long as they are registered with the same namespace.

IMO the only benefit of this is the possibility of an exception. And if that is the case, the `registerNodeType` method has not completed successfully and therefore the  _other_ `schemata` member (from `RepositoryNodeTypeManager`) has not been cleared. So we shouldn't clear this one either.

So in this case, I don't see any benefit to the `finally` block. However, this "idiom" should be evaluated on a case-by-case basis, as it may be useful in certain places.