Fix build

h2/src/main/org/h2/command/Parser.java

@@ -3795,9 +3795,7 @@ public class Parser {
                 column.setSelectivity(selectivity);
             }
             Expression checkConstraint = templateColumn.getCheckConstraint(session, columnName);
-            if (checkConstraint != null) {
-                column.addCheckConstraint(session, checkConstraint);
-            }
+            column.addCheckConstraint(session, checkConstraint);
         }
         column.setComment(comment);
         column.setOriginalSQL(original);

h2/src/main/org/h2/table/Column.java

@@ -537,6 +537,9 @@ public class Column {
      * @param expr the (additional) constraint
      */
     public void addCheckConstraint(Session session, Expression expr) {
+        if (expr == null) {
+            return;
+        }
         resolver = new SingleColumnResolver(this);
         synchronized (this) {
             String oldName = name;