[issue18533] Avoid error from repr() of recursive dictview

[STINNER Victor]

STINNER Victor added the comment:

non-error-recursive-dictview-3.3.patch: small nit, initialize result to NULL, instead of setting it to NULL only in case of error. It makes the code more readable and it is the common coding style to handle errors.

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<http://bugs.python.org/issue18533>
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