Patch for regression in clang-format.py in r235080

[Schlottke, Michael]

Hi everyone,

in r235080 a “fallback_style” option was introduced to clang-format.py. However, now clang-format.py does not work anymore if no fallback style was defined in vim:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/home/mic/.pool/.src/llvm/tools/clang/tools/clang-format/clang-format.py", line 89, in <module>
    main()
  File "/home/mic/.pool/.src/llvm/tools/clang/tools/clang-format/clang-format.py", line 63, in main
    if fallback_style:
NameError: global name 'fallback_style' is not defined

I’ve included a patch to initialize fallback_style to None for the case where g:clang_format_fallback_style is not set in vim.

Michael

P.S.: Please excuse if this should not be the right venue to post this bug/patch, this is my first attempt.

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