Don't require that a RuntimeError is raised when playing a second sound while the first one is still running, as the first one one might already have finished.
Don't require that a RuntimeError is raised when playing a second
sound while the first one is still running, as the first one
one might already have finished.

Fixes part of SF bug #763052.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator