Exceptions in __Pyx_InitGlobals() lead to a crash

[scoder]

When an exception is raised in __Pyx_InitGlobals(), __pyx_m is not yet initialised, so this line in __Pyx_AddTraceback() crashes:

    py_globals = PyModule_GetDict(__pyx_m);

The same applies to the creation of __pyx_empty_tuple.

A fix might be to move __Pyx_InitGlobals() and friends after the module object creation, or to provide a separate error label for early errors.

BTW, I wonder if __pyx_m leaks in case of an error.

[scoder]

The leaking of pyx_m should be fixed now. However, it needs to be rethought for tickets #173 and #218 anyway (PEP 3121).

[robertwb]

I'm not too worried about memory leaks--it's not something that's going to happen again and again, and we'd be leaking all the globals that got initialized up to that point anyways.

I both moved __Pyx_InitGlobals() later and provided different error handling code when __pyx_m is not yet initialized.

[robertwb]

 http://hg.cython.org/cython-devel/rev/c951607190c2