Null Reference Exception in service discovery

[brynrhodes]

This line doesn't check whether there is a Library, resulting in a NullReferenceException:

https://github.com/DBCG/org-opencds-cqf-cds/blob/master/src/main/java/org/opencds/cqf/cds/discovery/DiscoveryResolutionR4.java#L184