[bugfix][TDengine]Added null check in TDengineSourceReader's convertDataType method

[edisonX-sudo]

logs below printed while invoking method: convertDataType with a null parameter

2024-04-16 11:27:13,131 ERROR [o.a.s.c.s.SeaTunnel           ] [main] -
===============================================================================



Exception in thread "main" org.apache.seatunnel.core.starter.exception.CommandExecuteException: SeaTunnel job executed failed
	at org.apache.seatunnel.core.starter.seatunnel.command.ClientExecuteCommand.execute(ClientExecuteCommand.java:199)
	at org.apache.seatunnel.core.starter.SeaTunnel.run(SeaTunnel.java:40)
	at org.apache.seatunnel.core.starter.seatunnel.SeaTunnelClient.main(SeaTunnelClient.java:34)
Caused by: org.apache.seatunnel.engine.common.exception.SeaTunnelEngineException: org.apache.seatunnel.connectors.seatunnel.tdengine.exception.TDengineConnectorException: ErrorCode:[COMMON-12], ErrorDescription:[Source reader operation failed, such as (open, close) etc...] - TDengine split read error
	at org.apache.seatunnel.connectors.seatunnel.tdengine.source.TDengineSourceReader.lambda$pollNext$0(TDengineSourceReader.java:78)
	at java.lang.Iterable.forEach(Iterable.java:75)
	at org.apache.seatunnel.connectors.seatunnel.tdengine.source.TDengineSourceReader.pollNext(TDengineSourceReader.java:73)
	at org.apache.seatunnel.engine.server.task.flow.SourceFlowLifeCycle.collect(SourceFlowLifeCycle.java:150)
	at org.apache.seatunnel.engine.server.task.SourceSeaTunnelTask.collect(SourceSeaTunnelTask.java:116)
	at org.apache.seatunnel.engine.server.task.SeaTunnelTask.stateProcess(SeaTunnelTask.java:168)
	at org.apache.seatunnel.engine.server.task.SourceSeaTunnelTask.call(SourceSeaTunnelTask.java:121)
	at org.apache.seatunnel.engine.server.TaskExecutionService$BlockingWorker.run(TaskExecutionService.java:643)
	at org.apache.seatunnel.engine.server.TaskExecutionService$NamedTaskWrapper.run(TaskExecutionService.java:944)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:750)
Caused by: java.lang.NullPointerException
	at org.apache.seatunnel.connectors.seatunnel.tdengine.source.TDengineSourceReader.convertDataType(TDengineSourceReader.java:150)
	at org.apache.seatunnel.connectors.seatunnel.tdengine.source.TDengineSourceReader.read(TDengineSourceReader.java:142)
	at org.apache.seatunnel.connectors.seatunnel.tdengine.source.TDengineSourceReader.lambda$pollNext$0(TDengineSourceReader.java:76)
	... 13 more

	at org.apache.seatunnel.core.starter.seatunnel.command.ClientExecuteCommand.execute(ClientExecuteCommand.java:191)
	... 2 more
2024-04-16 11:27:13,132 INFO  [s.c.s.s.c.ClientExecuteCommand] [Thread-7] - run shutdown hook because get close signal

[Hisoka-X]

Could you add test case in e2e? Thanks.

[edisonX-sudo]

will do

[edisonX-sudo]

Could you add test case in e2e? Thanks.

Test case done
BTW, another null-exception bug in TDengineSourceReader found&fixed because of the new test case