Catch the StopIteration that result from PEP-479 or add default value in next

[Pierre-Sassoulas]

StopIteration exceptions raised directly or indirectly in coroutines
and generators are transformed into RuntimeError exceptions for python
3.7+.

Description

Handle all the StopIteration and not just the one that caused pylint-dev/pylint#4631

Type of Changes

	Type
✓	🐛 Bug fix
✓	🔨 Refactoring

Related Issue

Closes pylint-dev/pylint#4631
Closes #1080

[Pierre-Sassoulas]

I'm going to merge as it's preventing crash and all pylint tests still work, but I'm still interested in a review if you think there's a more elegant way to do it :)

[cdce8p]

I'm not too familiar with the infer logic unfortunately. The only other way I can think of at the moment would be to make sure each infer method always returns an iterator and doesn't raise StopIteration on the first call of next. However that might be difficult to do, as we would need to understand and check every inference method.

[hippo91]

@Pierre-Sassoulas i think you did the right thing to do.