Reduced the number of String allocations for the NONE parameterList case.

Please double-check me on this, but I think previously "NONE" would only be appended if the builder was empty.  Rather than append to the builder and convert to a String, which will allocate a new copy of the String, I just return the String literal directly.  In a sample of a production app that was up for < 15 min., I had 6,346 copies of this String.