MAP: Empty parameter mask handled wrong

If an empty parameter mask is set in a get message listing request
we only returned the handles, where as the spec states that we
should return all parameters.

Solution: Set the parameter filter to 0xFFFF if it is omitted or 0.

Change-Id: I2cb99569c0920c706c0d3b3ed269852471cb1ee6
Bug: 12915453