When reloading the repository the HST repository connection pool keeps trying to use the old and now invalid repository instance

When reloading the repository is that the HST repository connection pool breaks as it keeps hold onto the old repository instance once it connected with one.

A simple fix is to check if the underlying repository is (no longer) initialized and then reload a new instance instead.
For this a few minor implementation changes are needed within the repository and the repository connector, without need to change underlying APIs.
A better solution is to introduce repository event listeners (on HippoRepository) but this will require API changes, which will be done on trunk only (separate issue).