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This answer reports the error in rosgraph.masterapi.nodeLookup.

The xmlrpclib response while looking up the node is parsed through the _succeed function (see link below). Note that only val is passed back in this function. https://code.ros.org/trac/ros/browser/stacks/ros_comm/trunk/tools/rosgraph/src/rosgraph/masterapi.py?rev=16525#L136

As a result, the actual nodeLookup function passes back val, and the code and msg fields are lost. See https://code.ros.org/trac/ros/browser/stacks/ros_comm/trunk/tools/rosgraph/src/rosgraph/masterapi.py?rev=16525#L417

The following call tries to parse code, msg, uri from the call, and causes an exception and fails. https://code.ros.org/trac/ros/browser/stacks/ros_comm/trunk/tools/rosgraph/src/rosgraph/impl/graph.py?rev=16525#L460

Fixing the code in graph.py corrects rxgraph execution, however my rosgraph output remains unchanged. Will debug that shortly.

This answer reports problem was attributed to 2 separate bugs in the error rosgraph python scripts, that have been reported in rosgraph.masterapi.nodeLookup.2 separate tickets (ticket 3946 and ticket 3947). Patches to fix the problem are included in both tickets.