#11 Code block marked as containing CSS (but actually contains XML) breaks processing

[Radu Coravu]

In the XML I have a codeblock like:

    <codeblock outputclass="language-css"> &lt;p padding-left="20">....</codeblock>

which was marked by accident to be parsed using the XSLTHL CSS token marker although it contains XML, when applying the XSLT we obtain:

 [xslt] java.lang.NullPointerException
 [xslt]     at net.sf.xslthl.highlighters.NumberHighlighter.startsWith(NumberHighlighter.java:138)
 [xslt]     at net.sf.xslthl.MainHighlighter.highlight(MainHighlighter.java:100)
 [xslt]     at net.sf.xslthl.ConnectorSaxonEE.highlight(ConnectorSaxonEE.java:116)
 [xslt]     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

[Radu Coravu]

Guarded NPE + added TC