richedit: empty text should result in a scroll range of 0. Tests for this behavior.

[Alex Villací­s Lasso]

Even though the code freeze is still in effect, I post this so that it 
will be reviewed. For more information, see bug #12311.

Changelog:
* richedit: empty text should result in a scroll range of 0.
* Tests for this behavior.

-- 
perl -e '$x=2.4;print sprintf("%.0f + %.0f = %.0f\n",$x,$x,$x+$x);'

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