From 1bf6bf774dbc8c6c2051963a81100ea1114b497f Mon Sep 17 00:00:00 2001
From: Robin Leroy <egg.robin.leroy@gmail.com>
Date: Wed, 26 Mar 2025 12:36:22 +0100
Subject: [PATCH] ICU-23087 Pass null to applyPropertyAlias for a unary
 property query

---
 .../main/core/src/main/java/com/ibm/icu/text/UnicodeSet.java  | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/icu4j/main/core/src/main/java/com/ibm/icu/text/UnicodeSet.java b/icu4j/main/core/src/main/java/com/ibm/icu/text/UnicodeSet.java
index 0d1f957bfb6..b0da1f337ab 100644
--- a/icu4j/main/core/src/main/java/com/ibm/icu/text/UnicodeSet.java
+++ b/icu4j/main/core/src/main/java/com/ibm/icu/text/UnicodeSet.java
@@ -3601,7 +3601,7 @@ public class UnicodeSet extends UnicodeFilter implements Iterable<String>, Compa
             }
         }
 
-        if (valueAlias.length() > 0) {
+        if (valueAlias != null && !valueAlias.isEmpty()) {
             p = UCharacter.getPropertyEnum(propertyAlias);
 
             // Treat gc as gcm
@@ -3835,7 +3835,7 @@ public class UnicodeSet extends UnicodeFilter implements Iterable<String>, Compa
         else {
             // Handle case where no '=' is seen, and \N{}
             propName = pattern.substring(pos, close);
-            valueName = "";
+            valueName = null;
 
             // Handle \N{name}
             if (isName) {