[6.6.0] fix pb to string bug and add trace in down load map cache

core/mogo-core-function-call/src/main/java/com/mogo/eagle/core/function/call/autopilot/CallerAutopilotStatisticsListenerManager.kt

@@ -23,13 +23,13 @@ object CallerAutopilotStatisticsListenerManager : CallerBase<IMoGoAutopilotStati
                         FSMMsg(
                             0,
                             "自动驾驶启动失败",
-                            it.failedMessage.msg,
+                            (it.failedMessage.msg?:""),
                             System.currentTimeMillis()
                         )
                     )
                 )
             } else {
-                CallerTrace.write("AutopilotStatistics", mapOf("status" to it.status, "failedMessage" to it.failedMessage,
+                CallerTrace.write("AutopilotStatistics", mapOf("status" to it.status, "failedMessage" to (it.failedMessage.msg?:""),
                         "req" to it.req, "usedTime" to it.usedTime,
                         "isDemoMode" to FunctionBuildConfig.isDemoMode,
                         "isTakeoverRemind" to FunctionBuildConfig.isTakeoverRemind))