log.debug fails when waiting for ROS Master

[IanTheEngineer]

If there is no ROS master available, rosnodejs will wait in a loop for one to appear. However, it currently kicks out with an error:

$ node example.js 
[/my_node][INFO] 2016-05-18 11:25:14.994-0400: Connecting to ROS Master at http://localhost:11311
/home/imcmahon/dev/gennodejs_tests2/src/rosnodejs/utils/xmlrpc_utils.js:7
    log.debug('Calling method ' + method +': ' + data);
       ^

TypeError: Cannot read property 'debug' of undefined
    at Object.call (/home/imcmahon/dev/gennodejs_tests2/src/rosnodejs/utils/xmlrpc_utils.js:7:8)
    at ClientRequest.<anonymous> (/home/imcmahon/dev/gennodejs_tests2/src/rosnodejs/utils/xmlrpc_utils.js:23:16)
    at emitOne (events.js:90:13)
    at ClientRequest.emit (events.js:182:7)
    at Socket.socketErrorListener (_http_client.js:306:9)
    at emitOne (events.js:90:13)
    at Socket.emit (events.js:182:7)
    at emitErrorNT (net.js:1265:8)
    at _combinedTickCallback (internal/process/next_tick.js:74:11)
    at process._tickCallback (internal/process/next_tick.js:98:9)