bitbake: bb/exceptions: Drop obsolete 2.6 code

In python 3 we should always have named tuples in this context. Drop
the obsolete exception handling.

(Bitbake rev: c11c9f18dad1cf4cb21e3bd873338ecc95652062)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/exceptions.py

@@ -38,14 +38,8 @@ def _get_frame_args(frame):
     """Get the formatted arguments and class (if available) for a frame"""
     arginfo = inspect.getargvalues(frame)
 
-    try:
-        if not arginfo.args:
+    if not arginfo.args:
             return '', None
-    # There have been reports from the field of python 2.6 which doesn't 
-    # return a namedtuple here but simply a tuple so fallback gracefully if
-    # args isn't present.
-    except AttributeError:
-        return '', None
 
     firstarg = arginfo.args[0]
     if firstarg == 'self':