[AUD-452] - Fix ipld blocks table init

[vicky-g]

Description

What is the purpose of this PR? What is the current behavior? New behavior? Relevant links (e.g. Trello) and/or information pertaining to PR?

Similar to #1191

Tests

List the manual tests and repro instructions to verify that this PR works as anticipated. Include log analysis if possible.
❗ If this change impacts clients, make sure that you have tested the clients ❗

Before:

Error msg:

{"levelno": 40, "level": "ERROR", "msg": "IPLDBLACKLIST | Fatal error in main loop\nTraceback (most recent call last):\n  File \"/audius-discovery-provider/src/tasks/index_blacklist.py\", line 211, in update_ipld_blacklist_task\n    initialize_blacklist_blocks_table_if_necessary(db)\n  File \"/audius-discovery-provider/src/tasks/index_blacklist.py\", line 28, in initialize_blacklist_blocks_table_if_necessary\n    assert (\nAssertionError: Corrupted DB State - Expect single row marked as current", "timestamp": "2021-03-22 18:28:10,809"}
{"levelno": 40, "level": "ERROR", "msg": "Task update_ipld_blacklist[23f7e973-a49d-4617-b319-ad571a8a7ac4] raised unexpected: AssertionError('Corrupted DB State - Expect single row marked as current')\nTraceback (most recent call last):\n  File \"/usr/local/lib/python3.8/site-packages/celery/app/trace.py\", line 382, in trace_task\n    R = retval = fun(*args, **kwargs)\n  File \"/usr/local/lib/python3.8/site-packages/celery/app/trace.py\", line 641, in __protected_call__\n    return self.run(*args, **kwargs)\n  File \"/audius-discovery-provider/src/tasks/index_blacklist.py\", line 325, in update_ipld_blacklist_task\n    raise e\n  File \"/audius-discovery-provider/src/tasks/index_blacklist.py\", line 211, in update_ipld_blacklist_task\n    initialize_blacklist_blocks_table_if_necessary(db)\n  File \"/audius-discovery-provider/src/tasks/index_blacklist.py\", line 28, in initialize_blacklist_blocks_table_if_necessary\n    assert (\nAssertionError: Corrupted DB State - Expect single row marked as current", "timestamp": "2021-03-22 18:28:10,810", "data": {"hostname": "celery@b01bb43a3d83", "id": "23f7e973-a49d-4617-b319-ad571a8a7ac4", "name": "update_ipld_blacklist", "exc": "AssertionError('Corrupted DB State - Expect single row marked as current')", "traceback": "Traceback (most recent call last):\n  File \"/usr/local/lib/python3.8/site-packages/celery/app/trace.py\", line 382, in trace_task\n    R = retval = fun(*args, **kwargs)\n  File \"/usr/local/lib/python3.8/site-packages/celery/app/trace.py\", line 641, in __protected_call__\n    return self.run(*args, **kwargs)\n  File \"/audius-discovery-provider/src/tasks/index_blacklist.py\", line 325, in update_ipld_blacklist_task\n    raise e\n  File \"/audius-discovery-provider/src/tasks/index_blacklist.py\", line 211, in update_ipld_blacklist_task\n    initialize_blacklist_blocks_table_if_necessary(db)\n  File \"/audius-discovery-provider/src/tasks/index_blacklist.py\", line 28, in initialize_blacklist_blocks_table_if_necessary\n    assert (\nAssertionError: Corrupted DB State - Expect single row marked as current\n", "args": "[]", "kwargs": "{}", "description": "raised unexpected", "internal": false}}

Now:

Added a user and confirmed the indexing worked as expected.