Ensure tables response is always a string

[simon-leech]

In the location.get get, it is currently getting the first table in the tables object that is not null. However, null is converted to an empty object in XYZ, so presently this returns an error.
This PR simply adds a check to ensure that the response has to be a string, ensuring objects and null are omitted.

Example here

// example 
const layer2 = {
    "tables": {
    "10": {},
    "11": "schema.table"
  }
}

//  CURRENT METHOD
const layer2table = layer2.table || Object.values(layer2.tables).find(table => !!table)
console.log(layer2table);

// PR CHANGE
const layer2tableNEW = layer2.table ??= 
    Object.values(layer2.tables).find(table => typeof table === 'string')

console.log(layer2tableNEW);

[sonarqubecloud]

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[dbauszus-glx]

lgtm