Don't submit limits on alerts

piker/clearing/_ems.py

@@ -179,6 +179,11 @@ async def execute_triggers(
                         # majority of iterations will be non-matches
                         continue
 
+                    action = cmd['action']
+
+                    if action != 'alert':
+                        # executable order submission
+
                         # submit_price = price + price*percent_away
                         submit_price = price + abs_diff_away
 
@@ -205,6 +210,10 @@ async def execute_triggers(
                         # register broker request id to ems id
                         book._broker2ems_ids[reqid] = oid
 
+                    else:
+                        # alerts have no broker request id
+                        reqid = ''
+
                     resp = {
                         'resp': 'dark_executed',
                         'time_ns': time.time_ns(),