code: public Parameters getAsParametersWithDefault(String key, Parameters defaultValue) {
  		Parameters result = getAsNullableParameters(key);
  		return result != null ? result : defaultValue;
  	}
docs: Converts map element into an Parameters or returns default value if
  conversion is not possible.
  
  @param key          a key of element to get.
  @param defaultValue the default value
  @return Parameters value of the element or default value if conversion is not
  supported.