bb.exceptions: don't choke on frames without arguments

Signed-off-by: Chris Larson <chris_larson@mentor.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/lib/bb/exceptions.py b/lib/bb/exceptions.py
index 62d62cd4d..4dd3e2cc3 100644
--- a/lib/bb/exceptions.py
+++ b/lib/bb/exceptions.py
@@ -32,6 +32,9 @@ class TracebackEntry(namedtuple.abc):
 def _get_frame_args(frame):
     """Get the formatted arguments and class (if available) for a frame"""
     arginfo = inspect.getargvalues(frame)
+    if not arginfo.args:
+        return '', None
+
     firstarg = arginfo.args[0]
     if firstarg == 'self':
         self = arginfo.locals['self']