Fixed issue causing the local repository data backup to be overwritten with an empty list.

src/main/java/org/qortal/block/BlockChain.java

@@ -516,7 +516,6 @@ public class BlockChain {
 				needsArchiveRebuild = (repository.getBlockArchiveRepository().fromHeight(2) == null);
 				if (needsArchiveRebuild) {
 					LOGGER.info("Couldn't retrieve block 2 from archive. Bootstrapping...");
-					Controller.getInstance().exportRepositoryData();
 				}
 			}
 		}