#4 Text with only whitespace is skipped

[clown]

When RapidXml parses the following XML (parse flag is 0),
the text of data node is empty.

<root>
<data> </data>
</root>

I tried to modify the code to preserve the whitespace
when parse_trim_whitespace is not set.

[clown]

[clown]

Sorry, I have a mistake.
I attach the bug-fixed diff file.

[clown]