Only output the URL for path items that have a URL. Output a : separator between items.

htdocs/theme/default/templates/view/artefact.tpl

 {include file="header.tpl"}
 
 {include file="columnfullstart.tpl"}
-        <h3><a href="{$WWWROOT}view/view.php?id={$viewid|escape}">{$viewtitle|escape}</a> {str tag=by section=view} <a href="{$WWWROOT}user/view.php?id={$viewowner}">{$formattedowner|escape}</a>: {foreach from=$artefactpath item=path}{if $path.url}<a href="{$path.url|escape}">{/if}{$path.title|escape}{if $path.url}</a>{/if}{/foreach}</h3>
+        <h3><a href="{$WWWROOT}view/view.php?id={$viewid|escape}">{$viewtitle|escape}</a> {str tag=by section=view} <a href="{$WWWROOT}user/view.php?id={$viewowner}">{$formattedowner|escape}</a>: {foreach name=path from=$artefactpath item=path}{if $path.url}<a href="{$path.url|escape}">{/if}{$path.title|escape}{if $path.url}</a>{/if}{if !$smarty.foreach.path.last}: {/if}{/foreach}</h3>
         <div id="view">
             <div id="bottom-pane">
                 <div id="column-container">