saltstack/salt — pull request #5419 by djs52 (2013-06-06 09:59:29+00:00)
Title: Check whether the MSI provider is installed, and don't try to query MSI if not

This is to address #4522 - test for the presence of the WBEM class that manages installed MSI packages before trying to query it, so that the exception occurs in a predictable place.