fix: value can be None
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@ -100,7 +100,7 @@ class HistoryList(MyTreeWidget, AcceptFileDragDrop):
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balance_str = fx.historical_value_str(balance, date)
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entry.append(balance_str)
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# fixme: should use is_mine
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if value < 0:
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if value is not None and value < 0:
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cg = self.wallet.capital_gain(tx_hash, fx.timestamp_rate, fx.ccy)
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entry.append("%.2f"%cg if cg is not None else _('No data'))
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item = QTreeWidgetItem(entry)
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