Description

introduced by #2825

failure:
RunAnsibleModuleFail: run module shell failed, Ansible Results => {"changed": true, "cmd": "config load_minigraph -y &>/dev/null -o", "delta": "0:00:30.051135", "end": "2023-07-09 14:15:58.815148", "failed": true, "msg": "non-zero return code", "rc": 1, "start": "2023-07-09 14:15:28.764013", "stderr": "", "stderr_lines": [], "stdout": "", "stdout_lines": []}

it is actually failing because of -o option calls override-config-table to overwrite configuration with golden_config_db.json.
in the test, golden_config_db.json could be empty or imcomplete config json files, which PR #2825 fail to support.

also noticed that, even handled incomplete config file format, test still fail to deserialize config_db:

File \"/usr/local/lib/python3.9/dist-packages/config/main.py\", line 1844, in override_config_db", "    sonic_cfggen.FormatConverter.to_deserialized(config_input)", "  File \"/usr/local/bin/sonic-cfggen\", line 185, in to_deserialized", "    new_key = ConfigDBConnector.deserialize_key(key)", "  File \"/usr/lib/python3/dist-packages/swsscommon/swsscommon.py\", line 2031, in deserialize_key", "    tokens = key.split(separator)", "AttributeError: 'tuple' object has no attribute 'split'"]

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