Add NULL check for gen->gi_code in gen_send_ex()
_PyGen_Finalize() checks that gen->gi_code is not NULL before it accesses the flags of the code object. This means that the flag could be NULL. It passes down the generatore to gen_close() and gen_send_ex(). gen_send_ex() did not check for gen->gi_code != NULL. CID 1297900
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@ -167,7 +167,7 @@ gen_send_ex(PyGenObject *gen, PyObject *arg, int exc, int closing)
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/* Check for __future__ generator_stop and conditionally turn
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* a leaking StopIteration into RuntimeError (with its cause
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* set appropriately). */
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if (((PyCodeObject *)gen->gi_code)->co_flags &
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if (gen->gi_code != NULL && ((PyCodeObject *)gen->gi_code)->co_flags &
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(CO_FUTURE_GENERATOR_STOP | CO_COROUTINE | CO_ITERABLE_COROUTINE))
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{
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PyObject *exc, *val, *val2, *tb;
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