Fix str representation
Fix str representation

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