[Python] Commit patch #2089149: Director exception handling mangles

returned exception.  Exceptions raised by Python code in directors
are now passed through to the caller without change.  Also, remove
the ": " prefix which used to be added to other director exceptions
(eg, those due to incorrect return types).


git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@10827 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Lib/python/director.swg

@@ -208,10 +208,7 @@ namespace Swig {
         swig_msg += msg;
       }
       if (!PyErr_Occurred()) {
-        swig_msg.insert(0, ": ");
         PyErr_SetString(error, getMessage());
-      } else {
-        SWIG_Python_AddErrorMsg(getMessage());
       }
       SWIG_PYTHON_THREAD_END_BLOCK; 
     }