formatter: always store a literal template unnamed

Now spec.ref should be '' if spec.tmpl is specified. Since spec.ref is the
option to select the initial template to be rendered, it doesn't make sense
to store the given literal template as spec.ref.

mercurial/formatter.py

@@ -433,19 +433,16 b' def loadtemplater(ui, spec, cache=None):'
     assert not (spec.tmpl and spec.mapfile)
     if spec.mapfile:
         return templater.templater.frommapfile(spec.mapfile, cache=cache)
-    return _maketemplater(ui, spec.ref, spec.tmpl, cache=cache)
+    return maketemplater(ui, spec.tmpl, cache=cache)
 
 def maketemplater(ui, tmpl, cache=None):
     """Create a templater from a string template 'tmpl'"""
-    return _maketemplater(ui, '', tmpl, cache=cache)
-
-def _maketemplater(ui, topic, tmpl, cache=None):
     aliases = ui.configitems('templatealias')
     t = templater.templater(cache=cache, aliases=aliases)
     t.cache.update((k, templater.unquotestring(v))
                    for k, v in ui.configitems('templates'))
     if tmpl:
-        t.cache[topic] = tmpl
+        t.cache[''] = tmpl
     return t
 
 def formatter(ui, out, topic, opts):