The McpClientSession.handle method throws a null pointer exception.

[zyy202004]

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Bug description
When processing with the McpClientSession.handle method, a null pointer exception was thrown at this.pendingResponses.remove(response.getId()) when response.getId() was null. This null pointer exception disrupted the internal response handling loop on the client side, causing the connection to wait until the 20-second timeout period elapsed before interrupting the connection.

[quaff]

It should be fixed by #509