From caa9c2854f8463af48f662a1c4fff04c2ad94ef9 Mon Sep 17 00:00:00 2001
From: kwahlin <kalle.wahlin@kb.se>
Date: Wed, 20 Nov 2024 10:43:13 +0100
Subject: [PATCH] Don't intersect with empty

---
 .../bulk-change-scripts/removeSubdivision.groovy  | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/whelktool/src/main/resources/bulk-change-scripts/removeSubdivision.groovy b/whelktool/src/main/resources/bulk-change-scripts/removeSubdivision.groovy
index 5be2f57636..2624a3d208 100644
--- a/whelktool/src/main/resources/bulk-change-scripts/removeSubdivision.groovy
+++ b/whelktool/src/main/resources/bulk-change-scripts/removeSubdivision.groovy
@@ -72,7 +72,12 @@ Set<String> ids = [] as Set
 def (linked, blank) = removeSubdivision.split { it[ID_KEY] }
 linked.each { l ->
     selectByIds(linked.collect { it[ID_KEY] }) {
-        ids = ids.intersect(it.getDependers()) as Set<String>
+        def dependers = it.getDependers() as Set<String>
+        if (ids.isEmpty()) {
+            ids.addAll(it.getDependers())
+        } else {
+            ids = ids.intersect(dependers)
+        }
     }
 }
 if (!blank.isEmpty()) {
@@ -84,7 +89,13 @@ if (!blank.isEmpty()) {
      */
     blank.collect { whelk.sparqlQueryClient.queryIdsByPattern(toTurtleData((Map) it, whelk.jsonld.context)) }
             .min { it.size() }
-            .with { ids = ids.intersect(it) }
+            .with {
+                if (ids.isEmpty()) {
+                    ids.addAll(it)
+                } else {
+                    ids = ids.intersect(it)
+                }
+            }
 }
 
 selectByIds(ids) {