segfault scanner dump objects when nameless modules are loaded

[trbs]

Problem is reproducable (for me) when using IPython and meliae:

ipython -c "from meliae import scanner; scanner.dump_all_objects('filename.json')"
Segmentation fault

The cause is a nameless 'fake' module that is loaded in IPython.

In _scanner_core.c the name of the nameless module is being retrieved but this returns NULL from the Python API and thus segfaults.

This patch substitutes the standard "?" for the missing module name.

The result now looks like this in the dump/json file:

{"address": 52045648, "type": "FakeModule", "size": 64, "name": "?", "refs": [50188960, 52440512]}

[trbs (trbs)]

Added another patch this time with tests.

As per the tests it seems like it wants to ignore the name attribute all together then no name is set.
So updated the patch accordingly.

Result in the dump now looks like this (without the "name" attribute):

{"address": 43173904, "type": "FakeModule", "size": 64, "refs": [41323584, 43572240]}

[John A Meinel (jameinel)]

Thanks for the patch, I applied it to trunk, and the test case nicely showed the failure.