[I] Replace `.size() > 0` with `!.isempty()` [iceberg]

[via GitHub]

Fokko opened a new issue, #8810:
URL: https://github.com/apache/iceberg/issues/8810

   ### Feature Request / Improvement
   
   Suggestion by IDEA:
   
   
![image](https://github.com/apache/iceberg/assets/1134248/2d0a997e-9693-4283-8fc4-b9471a6fab6c)
   
   I think this is nice because `isEmpty` should be faster. We also have 
different implementations in `PartitionSet.java`:
   
   ```java
     @Override
     public int size() {
       return partitionSetById.values().stream().mapToInt(Set::size).sum();
     }
   
     @Override
     public boolean isEmpty() {
       return partitionSetById.values().stream().allMatch(Set::isEmpty);
     }
   ```
   
   ### Query engine
   
   Other


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