[Mono-list] a small XmlTextReader.ReadContent() modification

[ginga@kit.hi-ho.ne.jp]

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Hello.

I modified one line of the XmlTextReader.ReadContent() method.
40 failures and 8 errors of the System.Xml tests are
now reduced to 2 failures. I found some of the failures are because
of the fact that the only one empty element in the document wasn't
stored inside.

Thanks.


- Atsushi

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