[fix](table_options) fix potential NPE when quering table_options systable (#40944) #41040
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… table (apache#40944) Fix unstable issue like: ``` 2024-09-17 12:41:04,755 WARN (thrift-server-pool-4|384) [FrontendServiceImpl.fetchSchemaTableData():2292] Failed to fetchSchemaTableData java.lang.NullPointerException: Cannot invoke "org.apache.doris.catalog.MaterializedIndexMeta.getSchema()" because the return value of "java.util.Map.get(Object)" is null at org.apache.doris.catalog.OlapTable.getSchemaByIndexId(OlapTable.java:954) ~[doris-fe.jar:1.2-SNAPSHOT] at org.apache.doris.catalog.OlapTable.getSchemaByIndexId(OlapTable.java:947) ~[doris-fe.jar:1.2-SNAPSHOT] at org.apache.doris.catalog.OlapTable.getBaseSchema(OlapTable.java:2097) ~[doris-fe.jar:1.2-SNAPSHOT] at org.apache.doris.catalog.OlapTable.getKeyColAsString(OlapTable.java:2167) ~[doris-fe.jar:1.2-SNAPSHOT] at org.apache.doris.tablefunction.MetadataGenerator.tableOptionsForInternalCatalog(MetadataGenerator.java:1099) ~[doris-fe.jar:1.2-SNAPSHOT] at org.apache.doris.tablefunction.MetadataGenerator.tableOptionsMetadataResult(MetadataGenerator.java:1189) ~[doris-fe.jar:1.2-SNAPSHOT] at org.apache.doris.tablefunction.MetadataGenerator.getSchemaTableData(MetadataGenerator.java:273) ~[doris-fe.jar:1.2-SNAPSHOT] at org.apache.doris.service.FrontendServiceImpl.fetchSchemaTableData(FrontendServiceImpl.java:2289) ~[doris-fe.jar:1.2-SNAPSHOT] at jdk.internal.reflect.GeneratedMethodAccessor50.invoke(Unknown Source) ~[?:?] at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?] at java.lang.reflect.Method.invoke(Method.java:569) ~[?:?] at org.apache.doris.service.FeServer.lambda$start$0(FeServer.java:60) ~[doris-fe.jar:1.2-SNAPSHOT] at jdk.proxy2.$Proxy44.fetchSchemaTableData(Unknown Source) ~[?:?] at org.apache.doris.thrift.FrontendService$Processor$fetchSchemaTableData.getResult(FrontendService.java:4572) ~[fe-common-1.2-SNAPSHOT.jar:1.2-SNAPSHOT] at org.apache.doris.thrift.FrontendService$Processor$fetchSchemaTableData.getResult(FrontendService.java:4552) ~[fe-common-1.2-SNAPSHOT.jar:1.2-SNAPSHOT] at org.apache.thrift.ProcessFunction.process(ProcessFunction.java:38) ~[libthrift-0.16.0.jar:0.16.0] at org.apache.thrift.TBaseProcessor.process(TBaseProcessor.java:38) ~[libthrift-0.16.0.jar:0.16.0] at org.apache.thrift.server.TThreadPoolServer$WorkerProcess.run(TThreadPoolServer.java:250) ~[libthrift-0.16.0.jar:0.16.0] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136) ~[?:?] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) ~[?:?] at java.lang.Thread.run(Thread.java:840) ~[?:?] ```
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bp #40944