Fixed long term issue where logs would report "Repository in use by another process?" when the database actually failed to start for some other reason. It will now log the correct reason.

src/main/java/org/qortal/controller/Controller.java

@@ -407,8 +407,8 @@ public class Controller extends Thread {
 				RepositoryManager.rebuildTransactionSequences(repository);
 			}
 		} catch (DataException e) {
-			// If exception has no cause then repository is in use by some other process.
-			if (e.getCause() == null) {
+			// If exception has no cause or message then repository is in use by some other process.
+			if (e.getCause() == null && e.getMessage() == null) {
 				LOGGER.info("Repository in use by another process?");
 				Gui.getInstance().fatalError("Repository issue", "Repository in use by another process?");
 			} else {