transaction: always generate file on close

The conditionnal was buggy and file were only generated if "onclose" was
defined. By luck, "onclose" was always defined.

mercurial/transaction.py

@@ -329,12 +329,13 b' class transaction(object):'
     @active
     def close(self):
         '''commit the transaction'''
-        if self.count == 1 and self.onclose is not None:
+        if self.count == 1:
             self._generatefiles()
             categories = sorted(self._finalizecallback)
             for cat in categories:
                 self._finalizecallback[cat](self)
-            self.onclose()
+            if self.onclose is not None:
+                self.onclose()
 
         self.count -= 1
         if self.count != 0: