PropertyGridView: Prevent out-of-range access when committing next enumerable value (#14182)

## Proposed changes

- Update method `DoubleClickRow` and `OnMouseWheel`: After calling `gridEntry.GetPropertyValueList()`, check `values.Length > 0` before trying to access `values[index]`.

## Customer Impact

- Prevents IndexOutOfRangeException or similar crashes when users double‑click or scroll a PropertyGrid entry whose StandardValues list becomes empty at commit time.

Author: LeafShi1

src/System.Windows.Forms/System/Windows/Forms/Controls/PropertyGrid/PropertyGridInternal/PropertyGridView.cs

@@ -1298,6 +1298,12 @@ public void DoubleClickRow(int row, bool toggleExpand, int type)
             {
                 object[] values = gridEntry.GetPropertyValueList();
 
+                // If values.Length is 0, we can't cycle through anything.
+                if (values.Length == 0)
+                {
+                    return;
+                }
+
                 if (index >= (values.Length - 1))
                 {
                     index = 0;
@@ -3177,6 +3183,12 @@ protected override void OnMouseWheel(MouseEventArgs e)
                 int delta = e.Delta > 0 ? -1 : 1;
                 object[] values = _selectedGridEntry.GetPropertyValueList();
 
+                // Prevent out-of-range access
+                if (values.Length == 0)
+                {
+                    return;
+                }
+
                 if (delta > 0 && index >= (values.Length - 1))
                 {
                     index = 0;