Fix edge case in mapStrictHierarchy.
Fix edge case in mapStrictHierarchy.

The method was not catching all cases where a node needs to be renamed due to hierarchy issues, leading to those graphs failing to visualize.
Change: 120712411

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