Traceback (most recent call last):
  File "electrum\gui\qt\util.py", line 509, in on_commitData
TypeError: arguments did not match any overloaded call:
  QModelIndex(): too many arguments
  QModelIndex(QModelIndex): argument 1 has unexpected type 'NoneType'
  QModelIndex(QPersistentModelIndex): argument 1 has unexpected type 'NoneType'