hgwebdir: do not show RSS and Atom links for plain directories

Up until now the templates that show RSS and Atom feeds on the "repository
lists" (i.e. gitweb and monoblue) showed them for all entries, including regular
folders. Clicking on those "folder RSS" links would result in an error page
being shown.

This patch hides those links for regular folders.

mercurial/hgweb/hgwebdir_mod.py

@@ -304,7 +304,8 class hgwebdir(object):
                                description_sort="",
                                lastchange=d,
                                lastchange_sort=d[1]-d[0],
-                               archives=[])
+                               archives=[],
+                               isdirectory=True)
 
                     seendirs.add(name)
                     yield row

mercurial/templates/gitweb/map

@@ -294,7 +294,12 indexentry = '
     <td>{contact|obfuscate}</td>
     <td class="age">{lastchange|rfc822date}</td>
     <td class="indexlinks">{archives%indexarchiveentry}</td>
-    <td><div class="rss_logo"><a href="{url}rss-log">RSS</a> <a href="{url}atom-log">Atom</a></div></td>
+    <td>{if(isdirectory, '',
+            '<div class="rss_logo">
+                <a href="{url}rss-log">RSS</a> <a href="{url}atom-log">Atom</a>
+            </div>'
+            )}
+    </td>
   </tr>\n'
 indexarchiveentry = ' <a href="{url}archive/{node|short}{extension}">{type|escape}</a> '
 index = index.tmpl

mercurial/templates/monoblue/map

@@ -247,10 +247,11 indexentry = '
     <td class="age">{lastchange|rfc822date}</td>
     <td class="indexlinks">{archives%indexarchiveentry}</td>
     <td>
-      <div class="rss_logo">
-        <a href="{url}rss-log">RSS</a>
-        <a href="{url}atom-log">Atom</a>
-      </div>
+        {if(isdirectory, '',
+            '<div class="rss_logo">
+                <a href="{url}rss-log">RSS</a> <a href="{url}atom-log">Atom</a>
+            </div>'
+            )}
     </td>
   </tr>\n'
 indexarchiveentry = '<a href="{url}archive/{node|short}{extension}">{type|escape}</a> '