Fix null pointer exception in XhtmlParser #261
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Make characters, including whitespace, after the `html' identifier in
<!DOCTYPE html> be optional. Otherwise, the following errors are
emitted:
file.xml:2:15: whitespace expected<html xmlns="http://www.w3.org/1999/xhtml"> ^
file.xml:2:15: document must contain exactly one element
And a java.lang.NullPointerException is thrown.
Unfortunately, testing with Source.fromString doesn't reproduce the
NullPointerException that occurs with Source.fromFile.
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Fixes #259.
This one-line change seems low enough risk that it could be included in the next bug-fix release.