hgweb: wrap {rename} with mappinglist

No bare list of mappings should be put in a template mapping.

mercurial/hgweb/webcommands.py

@@ -819,7 +819,7 b' def filediff(web):'
         rename = webutil.renamelink(fctx)
         ctx = fctx
     else:
-        rename = []
+        rename = templateutil.mappinglist([])
         ctx = ctx
 
     return web.sendtemplate(
@@ -892,7 +892,7 b' def comparison(web):'
         rename = webutil.renamelink(fctx)
         ctx = fctx
     else:
-        rename = []
+        rename = templateutil.mappinglist([])
         ctx = ctx
 
     return web.sendtemplate(

mercurial/hgweb/webutil.py

@@ -234,8 +234,8 b' def children(ctx, hide=None):'
 def renamelink(fctx):
     r = fctx.renamed()
     if r:
-        return [{'file': r[0], 'node': hex(r[1])}]
-    return []
+        return templateutil.mappinglist([{'file': r[0], 'node': hex(r[1])}])
+    return templateutil.mappinglist([])
 
 def nodetagsdict(repo, node):
     return [{"name": i} for i in repo.nodetags(node)]