fix hold strategy

auto_trading/strat/prop.py

@@ -67,22 +67,23 @@ class Prop(Strategy):
 
         # Create the new buy orders from with the delta between the actual and the desired state.
         for stock, amount in desired_state_dolards.items():
-            if amount > state.stocks[stock]:
-                orders.append(
-                    Long(
-                        stock,
-                        amount / conversion_rate[stock] - state.stocks[stock],
-                        conversion_rate[stock],
+            if stock in state.stocks:
+                if amount > state.stocks[stock]:
+                    orders.append(
+                        Long(
+                            stock,
+                            amount / conversion_rate[stock] - state.stocks[stock],
+                            conversion_rate[stock],
+                        )
                     )
-                )
-            else:
-                orders.append(
-                    Short(
-                        stock,
-                        state.stocks[stock] - amount / conversion_rate[stock],
-                        conversion_rate[stock],
+                else:
+                    orders.append(
+                        Short(
+                            stock,
+                            state.stocks[stock] - amount / conversion_rate[stock],
+                            conversion_rate[stock],
+                        )
                     )
-                )
 
         # Filter low orders
         orders = list(filter(self.filter_order, orders))