Filter XML SQL query result

I have an XML column:

<xmlList> 
   <XMLEntity> 
      <sug>ACHR</sug>
   </XMLEntity>

  <XMLEntity> 
      <sug>DOA</sug>
   </XMLEntity>
</xmlList>

The sug can hold only a enum memeber(ACHER or DOA). I would like to check if there is a sug without one of these values.

In this way I get the sug node where they are not from enum values:

SELECT XMLSERIALIZE(XMLQUERY ('//xmlList/XMLEntity/sug[.!="ACHER" and .!="DOA"]'  
passing KTOVET ) as char large object) as XXX

FROM "TABLE" 

The result is OK, but wherever the sug is ACHER or DOA I get empty line. How can I avoid the empty lines from result?