NULL pointer access => crash
----------------------------

                 Key: XALANC-715
                 URL: https://issues.apache.org/jira/browse/XALANC-715
             Project: XalanC
          Issue Type: Bug
          Components: XalanC
    Affects Versions: CurrentCVS
         Environment: Any
            Reporter: Michael Kupchuk
             Fix For: CurrentCVS
         Attachments: crash.xsl, test.xml

Using a xalan:nodeset with an empty parameter causes it to return nodeset with 
no data, no parents, completly empty, which in further operations causes a NULL 
pointer access in release or debug assertion in debug.
Maybe it's not a "very proper" use of xalan:nodeset, but IMHO crash/assertion 
is not the correct behaviour at all.

Here is an example xslt to reproduce crash:
<?xml version='1.0' encoding='windows-1251'?>
<xsl:stylesheet exclude-result-prefixes="xalan" xmlns:xalan = 
"http://xml.apache.org/xalan"; xmlns:xsl="http://www.w3.org/1999/XSL/Transform"; 
version="1.0">
<xsl:output method="html" indent="yes" encoding='windows-1251'/>
<xsl:strip-space elements="*"/>

  <xsl:template name="head-with-info">
    <xsl:param name="head"/>
    <xsl:param name="info"/>
    <xsl:if test="xalan:nodeset($head)/node()">
      <div class="heading"><xsl:copy-of select="$head"/></div>
    </xsl:if>
    <xsl:if test="string-length($info)>0 and xalan:nodeset($info)/node()">
      <div class="group-info"><xsl:copy-of select="$info"/></div>
    </xsl:if>
  </xsl:template>
<xsl:template match="*" name="test">
    <xsl:value-of select="test_node/inner_test"/>
    <xsl:call-template name="head-with-info">
      <!-- <xsl:with-param name="head"><span>test head</span></xsl:with-param> 
-->
      <xsl:with-param name="info"><span>test info</span></xsl:with-param>
    </xsl:call-template>
</xsl:template>

</xsl:stylesheet>


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