Bugfix for jython: sometime frame.f_back does not exist:
Bugfix for jython: sometime frame.f_back does not exist:

http://sourceforge.net/tracker/index.php?func=detail&aid=1869450&group_id=85796&atid=577329


git-svn-id: cdbd3c3453b226d8644b39c93ea790e37ea3ca1b@2010 7f4d9e04-a92a-ab41-bea9-970b690ef4a7

fabioz/Pydev,RandallDW/Aruba_plugin,aptana/Pydev,aptana/Pydev,fabioz/Pydev,akurtakov/Pydev,rgom/Pydev,akurtakov/Pydev,RandallDW/Aruba_plugin,RandallDW/Aruba_plugin,akurtakov/Pydev,rajul/Pydev,akurtakov/Pydev,aptana/Pydev,fabioz/Pydev,rgom/Pydev,RandallDW/Aruba_plugin,fabioz/Pydev,rajul/Pydev,rgom/Pydev,RandallDW/Aruba_plugin,fabioz/Pydev,RandallDW/Aruba_plugin,rgom/Pydev,rajul/Pydev,rajul/Pydev,fabioz/Pydev,akurtakov/Pydev,rgom/Pydev,rgom/Pydev,rajul/Pydev,akurtakov/Pydev,rajul/Pydev