Merge pull request #740 from smukil/in_flight_nonrepairable_crash_fix

Turning on repairs shouldn't invoke repairs for in-flight queries

src/proto/dyn_redis_repair.c

@@ -867,6 +867,10 @@ rstatus_t redis_make_repair_query(struct context *ctx, struct response_mgr *rspm
  bool repair_by_add = false;
  uint32_t num_values = 0;
 
+ // If we enabled read repairs halfway, in flight commands will not be
+ // repairable.
+ if (rspmgr->msg->orig_msg == NULL) return DN_OK;
+
  // Redis commands either lookup keys or fields (secondary keys), so the number of
  // expected values would be based on either one of them.
  if (rspmgr->msg->orig_msg->msg_info.num_fields > 0) {