Fix custom view render_fn appending Documents

parse_xml() returns a Document, which was being appended causing an XML lib
error.

Fixes #12

lib/defaultcfg/cfg.d/views_render_items_example.pl

@@ -1,9 +1,6 @@
 
 # This is an example of a custom browse items renderer.
 
-# Note: This function needs to return a UTF-8 encoded string NOT XHTML DOM.
-# (this is to speed things up).
-
 # To use this add render_fn=render_view_items_3col_boxes" to the options of a variation of a view.
 # eg:
 #		variations => [
@@ -45,6 +42,6 @@
 		$cells += 1;
 	}
 
-	return $xml->to_string( $table );
+	return $table;
 };
 

perl_lib/EPrints/Update/Views.pm

@@ -710,7 +710,7 @@ sub update_view_list
 					$view,
 					$path_values,
 					$opts->{filename} );
-			$block = $xml->parse_string( $block )
+			$block = $xml->parse_string( $block )->documentElement
 				if !ref( $block );
 
 			$PAGE->appendChild( $xml->clone( $intro ) );