only calculate checkTableName once

wizard-server/src/main/java/org/cobbzilla/wizard/server/listener/SystemInitializerListener.java

@@ -31,8 +31,10 @@ public class SystemInitializerListener extends RestServerLifecycleListenerBase {
 
     // If no checkTableName is provided, use the table name for the first entity
     private String getCheckTableName(PgRestServerConfiguration config) {
-        if (!empty(checkTableName)) return checkTableName;
-        return camelCaseToSnakeCase(config.getEntityClassesReverse().get(0).getSimpleName());
+        if (empty(checkTableName)) {
+            checkTableName = camelCaseToSnakeCase(config.getEntityClassesReverse().get(0).getSimpleName());
+        }
+        return checkTableName;
     }
 
     @Override public void beforeStart(RestServer server) {