[fix](auditlog)Fix auditlog NPE (#45772)

[Jibing-Li]

backport: #45772

[hello-stephen]

Thank you for your contribution to Apache Doris.
Don't know what should be done next? See How to process your PR.

Please clearly describe your PR:

1. What problem was fixed (it's best to include specific error reporting information). How it was fixed.
2. Which behaviors were modified. What was the previous behavior, what is it now, why was it modified, and what possible impacts might there be.
3. What features were added. Why was this function added?
4. Which code was refactored and why was this part of the code refactored?
5. Which functions were optimized and what is the difference before and after the optimization?

[Jibing-Li]

run buildall

[doris-robot]

TPC-H: Total hot run time: 40475 ms

machine: 'aliyun_ecs.c7a.8xlarge_32C64G'
scripts: https://github.com/apache/doris/tree/master/tools/tpch-tools
Tpch sf100 test result on commit 789999954598868a143b27e0e6a288fdd4358143, data reload: false

------ Round 1 ----------------------------------
q1	17565	7370	7228	7228
q2	2045	181	177	177
q3	10924	1035	1184	1035
q4	10551	770	701	701
q5	7737	2845	2842	2842
q6	232	147	145	145
q7	980	619	609	609
q8	9571	1883	1963	1883
q9	7875	6354	6405	6354
q10	6991	2325	2327	2325
q11	454	271	261	261
q12	398	215	210	210
q13	17781	3008	3032	3008
q14	239	220	206	206
q15	557	520	524	520
q16	665	603	602	602
q17	974	633	575	575
q18	7189	6590	6467	6467
q19	4208	980	953	953
q20	474	205	194	194
q21	4117	3184	3179	3179
q22	1088	1005	1001	1001
Total cold run time: 112615 ms
Total hot run time: 40475 ms

----- Round 2, with runtime_filter_mode=off -----
q1	7392	7202	7190	7190
q2	328	239	235	235
q3	3004	2847	2855	2847
q4	2058	1775	1786	1775
q5	5692	5655	5736	5655
q6	222	139	148	139
q7	2215	1741	1766	1741
q8	3351	3363	3445	3363
q9	8865	8856	8776	8776
q10	3557	3472	3533	3472
q11	591	497	493	493
q12	823	610	574	574
q13	16423	3166	3148	3148
q14	300	285	263	263
q15	574	528	527	527
q16	713	676	657	657
q17	1859	1593	1590	1590
q18	8202	7889	7342	7342
q19	1729	1602	1461	1461
q20	2045	1854	1833	1833
q21	5414	5319	5184	5184
q22	1136	1041	1038	1038
Total cold run time: 76493 ms
Total hot run time: 59303 ms

[doris-robot]

TPC-DS: Total hot run time: 196493 ms

machine: 'aliyun_ecs.c7a.8xlarge_32C64G'
scripts: https://github.com/apache/doris/tree/master/tools/tpcds-tools
TPC-DS sf100 test result on commit 789999954598868a143b27e0e6a288fdd4358143, data reload: false

query1	1262	946	939	939
query2	6207	2030	1991	1991
query3	10954	4402	4340	4340
query4	66744	28738	23369	23369
query5	5655	441	432	432
query6	472	173	173	173
query7	6024	302	306	302
query8	325	226	232	226
query9	9335	2678	2669	2669
query10	508	258	258	258
query11	18059	15446	15626	15446
query12	167	96	107	96
query13	1579	431	421	421
query14	10972	7121	7424	7121
query15	214	181	189	181
query16	7913	549	503	503
query17	1093	580	588	580
query18	1927	319	323	319
query19	199	160	160	160
query20	117	110	110	110
query21	70	45	43	43
query22	4830	4563	4485	4485
query23	34558	34401	34221	34221
query24	5883	2930	2946	2930
query25	547	440	431	431
query26	715	178	172	172
query27	1747	302	309	302
query28	4623	2548	2507	2507
query29	717	459	470	459
query30	246	159	161	159
query31	1009	787	842	787
query32	75	58	54	54
query33	418	285	276	276
query34	918	500	493	493
query35	843	749	742	742
query36	1076	938	940	938
query37	117	71	69	69
query38	4175	3960	4049	3960
query39	1629	1483	1457	1457
query40	138	79	81	79
query41	54	46	47	46
query42	115	103	96	96
query43	524	499	489	489
query44	1132	789	791	789
query45	185	164	166	164
query46	1154	726	754	726
query47	1983	1927	1882	1882
query48	471	354	374	354
query49	732	375	379	375
query50	826	423	419	419
query51	7376	7316	7015	7015
query52	101	88	92	88
query53	254	184	185	184
query54	555	444	441	441
query55	76	77	73	73
query56	250	234	236	234
query57	1203	1096	1100	1096
query58	198	199	207	199
query59	3033	3020	2803	2803
query60	278	249	243	243
query61	107	105	105	105
query62	778	661	672	661
query63	209	188	192	188
query64	1775	664	627	627
query65	3248	3143	3144	3143
query66	731	305	299	299
query67	15786	15374	15541	15374
query68	4515	543	570	543
query69	449	255	263	255
query70	1161	1115	1108	1108
query71	447	249	253	249
query72	6605	3935	3891	3891
query73	753	335	353	335
query74	10342	8880	8847	8847
query75	3365	2589	2631	2589
query76	2465	1061	1013	1013
query77	475	265	271	265
query78	10698	9684	9659	9659
query79	5241	577	583	577
query80	1732	407	430	407
query81	552	241	245	241
query82	851	111	111	111
query83	256	145	145	145
query84	290	82	86	82
query85	1671	298	296	296
query86	467	288	297	288
query87	4476	4375	4255	4255
query88	5096	2370	2384	2370
query89	413	290	284	284
query90	2028	185	186	185
query91	184	145	147	145
query92	64	48	47	47
query93	5600	527	517	517
query94	848	289	291	289
query95	341	253	253	253
query96	614	272	278	272
query97	3355	3171	3154	3154
query98	231	211	219	211
query99	1885	1299	1297	1297
Total cold run time: 334664 ms
Total hot run time: 196493 ms

[Jibing-Li]

run p0