UnknownType errors encountered during validation look a bit ugly

[Julian]

⊙  ~[jsonschema:python] -c 'from jsonschema import Draft4Validator; Draft4Validator({"type": "flooglekins"}).validate("foo")'                                                                                                                                                                                                                                   Julian@home
Traceback (most recent call last):
  File "<module>", line 1, in <module>
  File "jsonschema/validators.py", line 134, in validate
    for error in self.iter_errors(*args, **kwargs):
  File "jsonschema/validators.py", line 110, in iter_errors
    for error in errors:
  File "jsonschema/_validators.py", line 290, in type_draft4
    if not any(validator.is_type(instance, type) for type in types):
  File "jsonschema/_validators.py", line 290, in <genexpr>
    if not any(validator.is_type(instance, type) for type in types):
  File "jsonschema/validators.py", line 139, in is_type
    raise UnknownType(type, instance, self.schema)
UnknownType:
Unknown type 'flooglekins' for validator with schema:
    {'type': 'flooglekins'}

While checking instance:
    'foo'

(This schema is invalid, but would like to clean up the empty extra line there).

[Julian]

This looks better now:

⊙  ~[jsonschema:python] -c 'from jsonschema import Draft4Validator; Draft4Validator({"type": "flooglekins"}).validate("foo")'                                                       julian@Airm
Traceback (most recent call last):
  File "/Users/julian/Development/jsonschema/jsonschema/validators.py", line 273, in is_type
    return self.TYPE_CHECKER.is_type(instance, type)
  File "/Users/julian/Development/jsonschema/jsonschema/_types.py", line 120, in is_type
    raise UndefinedTypeCheck(type) from None
jsonschema.exceptions.UndefinedTypeCheck: Type 'flooglekins' is unknown to this type checker

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/Users/julian/Development/jsonschema/jsonschema/validators.py", line 268, in validate
    for error in self.iter_errors(*args, **kwargs):
  File "/Users/julian/Development/jsonschema/jsonschema/validators.py", line 243, in iter_errors
    for error in errors:
  File "/Users/julian/Development/jsonschema/jsonschema/_validators.py", line 321, in type
    if not any(validator.is_type(instance, type) for type in types):
  File "/Users/julian/Development/jsonschema/jsonschema/_validators.py", line 321, in <genexpr>
    if not any(validator.is_type(instance, type) for type in types):
  File "/Users/julian/Development/jsonschema/jsonschema/validators.py", line 275, in is_type
    raise exceptions.UnknownType(type, instance, self.schema)
jsonschema.exceptions.UnknownType: Unknown type 'flooglekins' for validator with schema:
    {'type': 'flooglekins'}

While checking instance:
    'foo'