Description of problem: Nuage inventroy refresh fails when subnet with missing gateway address is returned from Nuage Server. Version-Release number of selected component (if applicable): How reproducible: When subnet without gateway address exists (not sure how this can be achieved since Nuage prevents you from adding such subnet) Steps to Reproduce: 1. Add subnet without gateway address (on Nuage Dashboard) 2. then trigger inventory refresh for MIQ Nuage provider 3. Actual results: Inventoring yields error Expected results: Inventoring should proceed, ignoring the missing value Additional info: