Adding empty string as a value and making column search param optional

[dekijovic]

For now in request body when adding a column, "search": {"value": "","regex": false} is required. For cases where search is handled differently this is an unused parameter that is required in a body. It should be optional. I added fix where this parameter if is not in the body column, default value is empty string

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[curry684]

Thank you 👍