TensorFlow: apply update to tensorboard_handler.  Fixes #1076.
TensorFlow: apply update to tensorboard_handler.  Fixes #1076.

Fix originally by danmane@, just upstreaming.
Change: 114618476

shakedel/tensorboard,qiuminxu/tensorboard,ioeric/tensorboard,shakedel/tensorboard,qiuminxu/tensorboard,tensorflow/tensorboard,ioeric/tensorboard,shakedel/tensorboard,agrubb/tensorboard,shakedel/tensorboard,agrubb/tensorboard,qiuminxu/tensorboard,francoisluus/tensorboard-supervise,ioeric/tensorboard,shakedel/tensorboard,tensorflow/tensorboard,agrubb/tensorboard,francoisluus/tensorboard-supervise,tensorflow/tensorboard,agrubb/tensorboard,francoisluus/tensorboard-supervise,agrubb/tensorboard,qiuminxu/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,ioeric/tensorboard,francoisluus/tensorboard-supervise,qiuminxu/tensorboard,francoisluus/tensorboard-supervise,qiuminxu/tensorboard,tensorflow/tensorboard,ioeric/tensorboard,agrubb/tensorboard,francoisluus/tensorboard-supervise,ioeric/tensorboard,shakedel/tensorboard,tensorflow/tensorboard