Build with rntuple sempty cluster

Author: linev

build/jsroot.js

@@ -14,7 +14,7 @@ const version_id = 'dev',
 
 /** @summary version date
   * @desc Release date in format day/month/year like '14/04/2022' */
-version_date = '14/08/2026',
+version_date = '20/08/2026',
 
 /** @summary version id and date
   * @desc Produced by concatenation of {@link version_id} and {@link version_date}
@@ -180552,7 +180552,7 @@ async function readHeaderFooter(tuple) {
       // Deserialize Page List. Get byte range of each cluster group
       const groups = tuple.builder.clusterGroups;
       if (!groups?.length)
-         throw new Error('No cluster groups found');
+         return tuple.builder; // process RNTuples with no cluster groups
 
       const ranges = [];
       for (const g of groups) {
@@ -181401,6 +181401,10 @@ async function rntupleProcess(rntuple, selector, args = {}) {
          handle.items.push(item);
       }
 
+      // no entries for empty clusters
+      if (builder.clusterSummaries === undefined)
+         return selector;
+
       // calculate number of entries
       builder.clusterSummaries.forEach(summary => { handle.lastentry += summary.numEntries; });
 

changes.md

@@ -11,6 +11,7 @@
 1. Use `8.6g`/`10.8g` format for float/double historgam content-to-text conversion in tooltips
 1. Add `@vite-ignore` comment to dynamic imports to suppress Vite/Rollup analysis warnings
 1. Fix - read all cluster groups from ntuple #415
+1. Fix - correctly handle empty clusters in ntuple #420
 
 
 ## Changes in 7.11.1

modules/core.mjs

@@ -6,7 +6,7 @@ const version_id = 'dev',
 
 /** @summary version date
   * @desc Release date in format day/month/year like '14/04/2022' */
-version_date = '14/08/2026',
+version_date = '20/08/2026',
 
 /** @summary version id and date
   * @desc Produced by concatenation of {@link version_id} and {@link version_date}