ignore zero prices, which are currently considered an error in submission

Author: jhunsaker

program/src/oracle/upd_aggregate.h

@@ -301,6 +301,7 @@ static void upd_aggregate( pc_price_t *ptr, uint64_t slot )
     int64_t slot_diff = slot - iptr->agg_.pub_slot_;
     if ( iptr->agg_.status_ == PC_STATUS_TRADING &&
          iptr->agg_.conf_ != 0UL &&
+         iptr->agg_.price_ != 0L &&
          slot_diff >= 0 && slot_diff <= PC_MAX_SEND_LATENCY ) {
       int64_t ipx = iptr->agg_.price_;
       uint32_t j = numa++;

pyth/tests/qset/3.result

@@ -1 +1 @@
-{"exponent":-3,"price":0,"conf":1000}
+{"exponent":-3,"price":0,"conf":0}

pyth/tests/qset/31.result

@@ -1 +1 @@
-{"exponent":-8,"price":42089,"conf":2164588150000}
+{"exponent":-8,"price":4329782800000,"conf":2616650000}

pyth/tests/qset/32.result

@@ -1 +1 @@
-{"exponent":-8,"price":4329782800000,"conf":2616650000}
+{"exponent":-8,"price":4329847900000,"conf":3031550000}