修复可能的空引用异常于_pressureSamples清理

将_pressureSamples[Index].Clear()改为可空调用，防止当_pressureSamples[Index]为null时抛出异常，提升代码健壮性。

TeamAAS-VM/Core/Management.cs

@@ -2117,7 +2117,7 @@ namespace TeamAAS_VP.Core
                 _pressureCts[Index]?.Cancel();
                 _pressureTimeoutCts[Index]?.Cancel();
                 _pressureLinkedCts[Index]?.Dispose();
-                _pressureSamples[Index].Clear();
+                _pressureSamples[Index]?.Clear();
 
                 _pressureCts[Index] = new CancellationTokenSource();
                 _pressureTimeoutCts[Index] = new CancellationTokenSource();