it`s have in "return else", or no ?

Read the first sentence of the description again.

you can find out how this works my researching Python default arguments

TypeError: hello() missing 1 required positional argument: 'name'
What`s wrong ?

I'm getting exactly the same mate.

Read this: https://docs.codewars.com/training/troubleshooting/#expected-the-same

or says Hello, World! if name is not given (or passed as an empty String).

Your code should handle that last case that raises an error.

Yes.

Basic Test Cases
Log
'Hello, John!'
None should equal 'Hello, John!'
Log
'Hello, Alice!'
None should equal 'Hello, Alice!'
Log
'Hello, World!'
None should equal 'Hello, World!'
Unexpected exception raised
Traceback (most recent call last):
File "/workspace/default/src/codewars-test/codewars_test/test_framework.py", line 111, in wrapper
func()
File "tests.py", line 18, in basic_test_cases
test.assert_equals(hello(), "Hello, World!")
TypeError: hello() missing 1 required positional argument: 'name'

This kata is buggy on javascript. the code speak about assertDeepEquals that is not in the attemp place, and more, after my code doesn't work for no reason cause its working outside.

if name is not given

You could be passed hello() with no arguments. you have to deal with that.

If you've got a function that's defined like this:

def my_function(a, b, c):
  ...

then a, b and c are positional arguments. When you later call the function with my_function(1, 2, 3), then a is equal to 1, b is equal to 2 and c is equal to 3. The values are assigned to the names based on their positions.

"Missing positional argument" means that there weren't enough values given to the function to match with all of the positional arguments. For example, if the function definition is def hello(name), if the tests call hello(), there are zero values but one positional argument. Research how to set a default value for an argument if one isn't provided.

site is difficult to get started - why no supporting examples about how to a submit code that works?

what is a 'missing positional argumen't?

this website: https://stackabuse.com/default-arguments-in-python-functions/ have a great answer, read theme Function with Default Arguments