[#12927] fix(function): Clarify blank type validation message

common/src/main/java/org/apache/gravitino/dto/requests/FunctionDataTypeValidator.java

diff --git a/common/src/main/java/org/apache/gravitino/dto/requests/FunctionDataTypeValidator.java b/common/src/main/java/org/apache/gravitino/dto/requests/FunctionDataTypeValidator.java
index bef5a6f..23fd3aa 100644
--- a/common/src/main/java/org/apache/gravitino/dto/requests/FunctionDataTypeValidator.java
+++ b/common/src/main/java/org/apache/gravitino/dto/requests/FunctionDataTypeValidator.java
@@ -74,7 +74,7 @@
       Types.ExternalType externalType = (Types.ExternalType) dataType;
       Preconditions.checkArgument(
           StringUtils.isNotBlank(externalType.catalogString()),
-          "\"%s.catalogString\" field is required and cannot be empty",
+          "\"%s.catalogString\" field is required and cannot be blank",
           fieldPath);
       return;
     }