fix ut

fe/fe-core/src/main/java/org/apache/doris/datasource/ExternalCatalog.java

@@ -595,7 +595,7 @@ public void createDb(CreateDbStmt stmt) throws DdlException {
         makeSureInitialized();
         if (metadataOps == null) {
             LOG.warn("dropDatabase not implemented");
-            throw new NotImplementedException("dropDatabase not implemented");
+            return;
         }
         try {
             metadataOps.createDb(stmt);
@@ -610,7 +610,7 @@ public void dropDb(DropDbStmt stmt) throws DdlException {
         makeSureInitialized();
         if (metadataOps == null) {
             LOG.warn("dropDatabase not implemented");
-            throw new NotImplementedException("dropDatabase not implemented");
+            return;
         }
         try {
             metadataOps.dropDb(stmt);
@@ -625,7 +625,7 @@ public void createTable(CreateTableStmt stmt) throws UserException {
         makeSureInitialized();
         if (metadataOps == null) {
             LOG.warn("createTable not implemented");
-            throw new NotImplementedException("createTable not implemented");
+            return;
         }
         try {
             metadataOps.createTable(stmt);
@@ -640,7 +640,7 @@ public void dropTable(DropTableStmt stmt) throws DdlException {
         makeSureInitialized();
         if (metadataOps == null) {
             LOG.warn("dropTable not implemented");
-            throw new NotImplementedException("dropTable not implemented");
+            return;
         }
         try {
             metadataOps.dropTable(stmt);