Enhancement of the invalid revision handler

Show the list of available branch

src/IDF/templates/idf/source/invalid_revision.html

@@ -5,6 +5,16 @@
 <p>{blocktrans}The revision <b>{$commit}</b> is not valid or does not exist
 in this repository.{/blocktrans}</p>
 
+<p>{blocktrans}List of available branch are listed below :{/blocktrans}</p>
+<ul>
+{foreach $branches as $branch => $path}
+{aurl 'url', 'IDF_Views_Source::treeBase', array($project.shortname, $branch)}
+<li class="label">
+  <a href="{$url}" class="label">{if $path}{$path}{else}{$branch}{/if}</a>
+</li>
+{/foreach}
+</ul>
+
 {if $isOwner or $isMember}
 {aurl 'url', 'IDF_Views_Source::help', array($project.shortname)}
 <p>{blocktrans}If this is a new repository, the reason for this error