Remove string empty check in getProperty

core/src/main/csharp/ch/cyberduck/core/preferences/ApplicationPreferences.cs

@@ -96,7 +96,7 @@ public class ApplicationPreferences<T> : DefaultPreferences
 
     public override string getProperty(string property)
     {
-        if (propertyStore[property] is not { } value || string.IsNullOrWhiteSpace(value))
+        if (propertyStore[property] is not { } value)
         {
             value = getDefault(property);
         }

core/src/test/csharp/ch/cyberduck/core/preferences/ApplicationPreferencesTests.cs

@@ -1,5 +1,6 @@
 using java.util;
 using NUnit.Framework;
+using System.Collections.Generic;
 
 namespace Ch.Cyberduck.Core.Preferences;
 
@@ -18,10 +19,46 @@ public class ApplicationPreferencesTests
         }
     }
 
+    [TestCase]
+    public void PersistsEmptyValue()
+    {
+        TestPreferences preferences = new();
+        preferences.setDefaults([
+            new("test.empty.default", "DONT")
+        ]);
+
+        Assert.AreEqual("DONT", preferences.getDefault("test.empty.default"));
+        preferences.setProperty("test.empty.default", "");
+        Assert.AreEqual("DONT", preferences.getDefault("test.empty.default"));
+        Assert.AreEqual("", preferences.getProperty("test.empty.default"));
+    }
+
+    [TestCase]
+    public void OverrideDefaultsDefault()
+    {
+        TestPreferences preferences = new();
+        preferences.setDefaults([
+            /* Mimick Cyberduck Defaults */
+            new("test.core.override", "CORE"),
+            /* Override in downstream Defaults */
+            new("test.core.override", "")
+        ]);
+
+        Assert.IsEmpty(preferences.getProperty("test.core.override"));
+    }
+
     public class TestPreferences : ApplicationPreferences<TestPreferences>
     {
         public TestPreferences() : base(new DefaultLocales(), new PropertyStoreFactory<MemoryPropertyStore>())
         {
         }
+
+        public void setDefaults(params KeyValuePair<string, string>[] testDefaults)
+        {
+            foreach (var item in testDefaults)
+            {
+                setDefault(item.Key, item.Value);
+            }
+        }
     }
 }