Update EnterpriseApiClient.get_enterprise_courses to account for EnterpriseCustomerCatalogs
Merge pull request #217 from edx/saleem-latif/ENT-697 [ENT-697]: Update EnterpriseApiClient.get_enterprise_courses to account for EnterpriseCustomerCatalogs
Merge pull request #217 from edx/saleem-latif/ENT-697 [ENT-697]: Update EnterpriseApiClient.get_enterprise_courses to account for EnterpriseCustomerCatalogs