function addIfNotNullOrEmpty(key, value){
    if(typeof value === 'string' && !util.stringIsEmpty(value)){
      settings[key] = value;
    } else if (typeof value == 'object' && !util.objectIsNull(value)) {
      settings[key] = value;
    }
  }
Creates a StorageServiceSettings object from the given connection string.

@param {string} connectionString The storage settings connection string.
@return {StorageServiceSettings}