Test that a task cannot be deleted with result.
Test that a task cannot be deleted with result.

When a result is created, the task is locked no matter what the owner
oes. Even if increases the n_answers value.

PyBossa/pybossa,geotagx/pybossa,Scifabric/pybossa,Scifabric/pybossa,geotagx/pybossa,PyBossa/pybossa