<rdar://problem/15906684>

The way in which we were determining whether a python module had already been imported in the current session stopped working due to the IOHandler changes
As a result, importing in a new debug session a module which had been imported in a previous session did not work
This commit restores that functionality by checking for the module's presence in the session dictionary (which should be more correct anyway)

llvm-svn: 201623

lldb/source/Interpreter/PythonDataObjects.cpp

@@ -84,6 +84,12 @@ PythonObject::Str ()
     return PythonString(str);
 }
 
+bool
+PythonObject::IsNULLOrNone () const
+{
+    return ((m_py_obj == nullptr) || (m_py_obj == Py_None));
+}
+
 //----------------------------------------------------------------------
 // PythonString
 //----------------------------------------------------------------------