Trade: empty amounts shall not be generated when legacy simulation is used

This reverts commit 414042ad partially,
which is required for testLegacySimulationPerformance

product/ERP5Legacy/Document/TradeModelRule.py

@@ -70,6 +70,8 @@ class TradeModelRule(Rule):
 
     context_movement = applied_rule.getParentValue()
     for amount in trade_condition.getAggregatedAmountList(context_movement):
+      if not amount.getQuantity():
+        continue
       # business path specific
       business_path_list = business_process.getPathValueList(
           trade_phase=amount.getTradePhaseList(), context=context_movement)