Failing unit test

@fhenneke first pointed out that there is some test that is now failing. Since I am personally a bit ignorant about this, any help would be appreciated. One option would be to just remove this test. cc @bh2smith @MartinquaXD

`=================================== FAILURES ===================================
__________________________ TestIPFS.test_get_content ___________________________

self = <tests.unit.test_ipfs.TestIPFS testMethod=test_get_content>

def test_get_content(self):
    self.assertEqual(
        {
            "version": "0.1.0",
            "appCode": "CowSwap",
            "metadata": {
                "referrer": {
                    "version": "0.1.0",
                    "address": "0x424a46612794dbb8000194937834250Dc723fFa5",
                }
            },
        },
        Cid.old_schema(
            "3d876de8fcd70969349c92d731eeb0482fe8667ceca075592b8785081d630b9a"
        ).get_content(ACCESS_KEY, max_retries=10),
    )
       self.assertEqual(
        {
            "version": "1.0.0",
            "appCode": "CowSwap",
            "metadata": {
                "referrer": {
                    "kind": "referrer",
                    "referrer": "0x8c35B7eE520277D14af5F6098835A584C337311b",
                    "version": "1.0.0",
                }
            },
        },
        Cid.old_schema(
            "1FE7C5555B3F9C14FF7C60D90F15F1A5B11A0DA5B1E8AA043582A1B2E1058D0C"
        ).get_content(ACCESS_KEY),
    )

 AssertionError: {'version': '1.0.0', 'appCode': 'CowSwap'[122 chars]0'}}} != None

tests/unit/test_ipfs.py:73: AssertionError
=========================== short test summary info ============================
FAILED tests/unit/test_ipfs.py::TestIPFS::test_get_content - AssertionError: {'version': '1.0.0', 'appCode': 'CowSwap'[122 chars]0'}}} != None`

Start by running TestIPFS.test_get_content in tests/unit/test_ipfs.py and inspect the Cid.old_schema calls shown in the failure. Determine why the second call returns None, then make the test reflect the intended behavior or document why it should be removed; the targeted test should no longer fail.