Remove IsAvailable check on CommitAsync. (dotnet#43059)

Author: adityamandaleeka

src/Middleware/Session/src/DistributedSession.cs

@@ -262,12 +262,6 @@ public async Task LoadAsync(CancellationToken cancellationToken = default)
     /// <inheritdoc />
     public async Task CommitAsync(CancellationToken cancellationToken = default)
     {
-        if (!IsAvailable)
-        {
-            _logger.SessionNotAvailable();
-            return;
-        }
-
         using (var timeout = new CancellationTokenSource(_ioTimeout))
         {
             var cts = CancellationTokenSource.CreateLinkedTokenSource(timeout.Token, cancellationToken);