No-op ConcurrentStack.PushRange(T[]) if empty

Resolves #62121.

src/libraries/System.Collections.Concurrent/src/System/Collections/Concurrent/ConcurrentStack.cs

@@ -316,6 +316,11 @@ public void PushRange(T[] items)
             {
                 throw new ArgumentNullException(nameof(items));
             }
+
+            // No op if the length is zero
+            if (items.Length == 0)
+                return;
+
             PushRange(items, 0, items.Length);
         }
 
@@ -349,7 +354,6 @@ public void PushRange(T[] items, int startIndex, int count)
             if (count == 0)
                 return;
 
-
             Node head, tail;
             head = tail = new Node(items[startIndex]);
             for (int i = startIndex + 1; i < startIndex + count; i++)

src/libraries/System.Collections.Concurrent/tests/ConcurrentStackTests.cs

@@ -63,6 +63,16 @@ public void PushRange_NoItems_NothingAdded()
             Assert.True(s.IsEmpty);
         }
 
+        [Fact]
+        public void PushRange_NoItems_NothingAdded_NoRangeSpecified()
+        {
+            var s = new ConcurrentStack<int>();
+            Assert.True(s.IsEmpty);
+
+            s.PushRange(new int[0]);
+            Assert.True(s.IsEmpty);
+        }
+
         [ConditionalTheory(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
         [InlineData(8, 10)]
         [InlineData(16, 100)]