When comparing a generic with an invalid type it creates an error during compile time

[Ashvin-Ranjan]

When comparing a generic with a NoneType in resolve_equal_special_types you will get this error:

Traceback (most recent call last):
  File "n.py", line 207, in <module>
  File "n.py", line 118, in run_file
  File "n.py", line 114, in run_file
  File "n.py", line 38, in type_check
  File "scope.py", line 2220, in type_check_command
  File "scope.py", line 1581, in type_check_expr
  File "scope.py", line 1519, in type_check_expr
  File "scope.py", line 2036, in type_check_command
  File "scope.py", line 2509, in type_check_command
  File "scope.py", line 1585, in type_check_expr
  File "type.py", line 270, in resolve_equal_types
  File "type.py", line 242, in resolve_equal_special_types
TypeError: object of type 'NoneType' has no len()
[3772] Failed to execute script n