[BUG] new OlapTableSink without any partition may cause IllegalStateException

[xinghuayu007]

Proposed changes

In LoadingTaskPlanner#Plan(): OlapTableSink olapTableSink = new OlapTableSink(table, tupleDesc, partitionIds); If the table does not has any partition, Preconditions.checkState will throw IllegalStateException, but the funtion only cath UserException, that will cause load job status can not be updated。
The issue: #4620

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[morningman]

This is not a good way to catch IllegalStateException here. Because it is a "Assertion" check in OlapTableSink.
We should check if partitionIds is empty before creating new OlapTableSink.

And by the way, there are severval place where the OlapTableSink's constructor is called, we should modify them too.

[xinghuayu007]

ok，I will check if partitionIds is empty before creating new OlapTableSink. And modify all where OlapTableSink's constructor is called.

[morningman]

Hi @xinghuayu007 , thanks for your PR, but I think #4658 has a more clear error msg.
So I approve that PR and will close this one.