Fix poll error in process.libs() and clean up maps parsing

[R42ccoon]

• Fix poll() error : deleting the not because the function returns None if the process is running
• Clean up maps parsing : replace memory_maps() by maps() and remove useless code

[R42ccoon]

Any update ?

[peace-maker]

Yes, sorry, I always wanted to check if this was broken before adding the poll() call at the beginning, since you removed parsing of the .addr attribute, but always forgot when being back at a computer. It seems like we need better tests for this function regardless :D

Can you confirm this was broken and the addr parsing isn't needed anymore?

[R42ccoon]

The addr parsing is already done by maps(). Also, i edited the commit to move the poll() check from libs() to maps(), because maps() is called is others functions. And i have added error handling, i put RuntimeError but there may be better.