py3: catch TypeError during template operations

Two places in this code Python 3 changed from raising ValueError
to TypeError. So catch the addition exceptions.

IMO this code might be better off performing type sniffing. But
I'm not sure the implications of changing that.

Differential Revision: https://phab.mercurial-scm.org/D2156

mercurial/templatekw.py

@@ -192,11 +192,15 b' def _showlist(name, values, mapping, plu'
     def one(v, tag=name):
         try:
             vmapping.update(v)
-        except (AttributeError, ValueError):
+        # Python 2 raises ValueError if the type of v is wrong. Python
+        # 3 raises TypeError.
+        except (AttributeError, TypeError, ValueError):
             try:
+                # Python 2 raises ValueError trying to destructure an e.g.
+                # bytes. Python 3 raises TypeError.
                 for a, b in v:
                     vmapping[a] = b
-            except ValueError:
+            except (TypeError, ValueError):
                 vmapping[name] = v
         return templ(tag, **pycompat.strkwargs(vmapping))
     lastname = 'last_' + name