Adding IF NOT EXISTS to CREATE log_event_dropped

Author: argzdev

transport/transport-runtime/src/main/java/com/google/android/datatransport/runtime/scheduling/persistence/SchemaManager.java

@@ -84,7 +84,7 @@ final class SchemaManager extends SQLiteOpenHelper {
   private static final String DROP_PAYLOADS_SQL = "DROP TABLE IF EXISTS event_payloads";
 
   private static final String CREATE_LOG_EVENT_DROPPED_TABLE =
-      "CREATE TABLE log_event_dropped "
+      "CREATE TABLE IF NOT EXISTS log_event_dropped "
           + "(log_source VARCHAR(45) NOT NULL,"
           + "reason INTEGER NOT NULL,"
           + "events_dropped_count BIGINT NOT NULL,"