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I found this answer in some Asian blog and it worked with me http://kawauso-festival.blogspot.com.eg/2016/07/ros-indigorqt.html

the steps were :

$ sudo pip uninstall pyparsing

$ pip install -Iv https://pypi.python.org/packages/source/p/pyparsing/pyparsing-1.5.7.tar.gz#md5=9be0fcdcc595199c646ab317c1d9a709

$ sudo pip install pydot

$ rosrun rqt_graph rqt_graph

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