Function.__str__ can raise a TypeError on special FunctionTypes

[ESultanik]

Describe the issue:

For special function types like FunctionType.CONSTRUCTOR_VARIABLES, the Function._name member variable will be None, yet the Function.name property will return a string as expected ("slitherConstructorVariables"). Function.__str__, however, returns self._name rather than self.name. Returning None from __str__ raises a TypeError at runtime.

Code example to reproduce the issue:

Every function for which Function._function_type == FunctionType.CONSTRUCTOR_VARIABLES seems to have this problem.

Version:

0.8.2

Relevant log output:

No response