Merge pull request #4994 from evolvedbinary/6.x.x/hotfix/error-java-stack-xdm-type

[6.x.x] Correct the XDM type for the Sequence holding a representation of a Java Stack Trace when an error occurs

Author: dizzzz

exist-core/src/main/java/org/exist/xquery/TryCatchExpression.java

@@ -530,7 +530,7 @@ private void addFunctionTrace(final Throwable t) throws XPathException {
 
     private void addJavaTrace(final Throwable t) throws XPathException  {
         final LocalVariable localVar = new LocalVariable(QN_JAVA_STACK_TRACE);
-        localVar.setSequenceType(new SequenceType(Type.QNAME, Cardinality.ZERO_OR_MORE));
+        localVar.setSequenceType(new SequenceType(Type.STRING, Cardinality.ZERO_OR_MORE));
 
         final Sequence trace;
 		if (t != null && t.getStackTrace() != null) {