[issue24347] unchecked return value in C OrderedDict

[Eric Snow]

Eric Snow added the comment:

Using PyDict_GetItemWithError() is a good idea.  Also, raising KeyError when the value is NULL (and no errors set) eliminates the crash.  Here's a patch that fixes the problem.  Unless there are any objections, I'll commit it in a couple hours.

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stage: test needed -> patch review
Added file: http://bugs.python.org/file39591/issue24347.dif

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