Revert accidental commit

Author: labkey-jeckels

core/src/org/labkey/core/mpc/McpServiceImpl.java

@@ -317,10 +317,6 @@ public ChatClient getChat(HttpSession session, String agentName, Supplier<String
                     .chatMemoryRepository(chatMemoryRepository)
                     .build();
 
-            // Filter empty messages to work around Spring AI GoogleGenAiChatModel bug
-            // https://github.com/spring-projects/spring-ai/issues/4556
-            advisors.add(new EmptyMessageFilterAdvisor());
-
             MessageChatMemoryAdvisor chatMemoryAdvisor = MessageChatMemoryAdvisor.builder(chatMemory)
                     .conversationId(conversationId)
                     .build();