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Backport PR #8159: Fix action do not provide icon....
Backport PR #8159: Fix action do not provide icon. action might be undefined then button will get no icon. Prevent throwing an uncatched error and insert warning sign on button Will do better one I allow text instead of icon

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convert.py
16 lines | 658 B | text/x-python | PythonLexer
"""Convert notebook to the v1 format."""
#-----------------------------------------------------------------------------
# Copyright (C) 2008-2011 The IPython Development Team
#
# Distributed under the terms of the BSD License. The full license is in
# the file COPYING, distributed as part of this software.
#-----------------------------------------------------------------------------
#-----------------------------------------------------------------------------
# Code
#-----------------------------------------------------------------------------
def upgrade(nb, orig_version=None):
raise ValueError('Cannot convert to v1 notebook format')