add safe_remaining

fixes #7757

freqtrade/persistence/trade_model.py

@@ -90,6 +90,13 @@ class Order(_DECL_BASE):
     def safe_filled(self) -> float:
         return self.filled if self.filled is not None else self.amount or 0.0
 
+    @property
+    def safe_remaining(self) -> float:
+        return (
+            self.remaining if self.remaining is not None else
+            self.amount - (self.filled or 0.0)
+        )
+
     @property
     def safe_fee_base(self) -> float:
         return self.ft_fee_base or 0.0

freqtrade/rpc/rpc.py

@@ -218,9 +218,10 @@ class RPC:
                     stoploss_current_dist_pct=round(stoploss_current_dist_ratio * 100, 2),
                     stoploss_entry_dist=stoploss_entry_dist,
                     stoploss_entry_dist_ratio=round(stoploss_entry_dist_ratio, 8),
-                    open_order='({} {} rem={:.8f})'.format(
-                        order.order_type, order.side, order.remaining
-                    ) if order else None,
+                    open_order=(
+                        f'({order.order_type} {order.side} rem={order.safe_remaining:.8f})' if
+                        order else None
+                    ),
                 ))
                 results.append(trade_dict)
             return results