[issue26811] segfault due to null pointer in tuple

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

References:

Issue23910 -- added original optimization (661cdbd617b8).
Issue24276 -- it was significant rewritten (5dbf3d932a59).

My suggestion in msg263886 to revert the optimization was related to the original code. Now, after reminding the background, I think it is worth to keep the optimization and try to fix the code.

Making the cached tuple to save None adds additional complexity and overhead (about 5%). Here is a patch that uses different trick. The size of saved tuple is set to 0.

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stage:  -> patch review
type:  -> crash
Added file: http://bugs.python.org/file42547/property_cached_args_set_size_0.patch

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