default line is zero in call_editor!

IPython/Extensions/ipy_editors.py

@@ -23,7 +23,7 b' def install_editor(run_template, wait = False):'
     the call.
     """
     
-    def call_editor(self, file, line):
+    def call_editor(self, file, line=0):
         if line is None:
             line = 0
         cmd = itplns(run_template, locals())