Fix #1487 - Allow for get_host returning None for WAMS service
Fix #1487 - Allow for get_host returning None for WAMS service

IBMStreams/streamsx.topology,wmarshall484/streamsx.topology,wmarshall484/streamsx.topology,wmarshall484/streamsx.topology,IBMStreams/streamsx.topology,wmarshall484/streamsx.topology,IBMStreams/streamsx.topology,ddebrunner/streamsx.topology,wmarshall484/streamsx.topology,ddebrunner/streamsx.topology,ddebrunner/streamsx.topology,ddebrunner/streamsx.topology,ddebrunner/streamsx.topology,IBMStreams/streamsx.topology,wmarshall484/streamsx.topology,ddebrunner/streamsx.topology,ddebrunner/streamsx.topology,wmarshall484/streamsx.topology,wmarshall484/streamsx.topology,IBMStreams/streamsx.topology,IBMStreams/streamsx.topology,IBMStreams/streamsx.topology