[jdom-interest] Tiny optimization

[Jason Hunter]

Done.  Good idea.

-jh-

Laurent Bihanic wrote:
> 
> In SAXHandler, in method characters() changing
>          if (suppress) return;
> into
>          if ((suppress) || (length == 0)) return;
> reduces by 5% the parsing time when using Crimson. Apparently this latter
> reports line breaks as character data of length 0.
> 
> The same should apply to ignorableWhitespace().
> 
> Laurent
> 
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