Do not crash using packages.list ds n debug build.

Change-Id: I491e0e708e78626cba176a9a5d71ba56dc192e95
diff --git a/src/traced/probes/probes_producer.cc b/src/traced/probes/probes_producer.cc
index 9128ba7..1933344 100644
--- a/src/traced/probes/probes_producer.cc
+++ b/src/traced/probes/probes_producer.cc
@@ -450,6 +450,7 @@
       }
       case SysStatsDataSource::kTypeId:
       case AndroidLogDataSource::kTypeId:
+      case PackagesListDataSource::kTypeId:
         break;
       default:
         PERFETTO_DFATAL("Invalid data source.");