remove_namespaces asserts on json TextResponse

[mohmad-null]

Regression.
As part of my unit tests, I have a well-formed JSON file that I'm using in some tests as "bad" data (the script wants XML).

I do something like this:

response = TextResponse(body='path-to.json', encoding='utf8')
response.selector.remove_namespaces()

This used to work (1.7.x), now (2.11.1) it asserts:

    def remove_namespaces(self) -> None:
        """
        Remove all namespaces, allowing to traverse the document using
        namespace-less xpaths. See :ref:`removing-namespaces`.
        """
		for el in self.root.iter("*"):
		AttributeError: 'dict' object has no attribute 'iter'

I appreciate JSON doesn't have namespaces, but it should fail gracefully, not raise an assertion.

[wRAR]

It's parsel, not Scrapy.

[mohmad-null]

Yes, I noticed that, but I figured Scrapy should catch it.

[wRAR]

I don't think Scrapy should catch it, and Scrapy will only able to do that by overriding remove_namespaces().

[mohmad-null]

But AttributeError: 'dict' object has no attribute 'iter' is a meaningless error for a scrapy user.
If there's an exception (fine), it should be something meaningful "Cannot remove namespaces from JSON" or something - that's why I consider it a Scrapy issue.

[wRAR]

The code is in parsel, not Scrapy. It should be done in parsel, not in Scrapy. Migrating.