A SQL case statement or two - sql

Question

I have a SELECT statement that pulls these two different product strips. When I delete one of them from the website and rerun my statement I still have two rows, the first column has the ARMCODE twice (two results) and the second column has the description for the first but then no description for the second (because it has been deleted).
Problem is it's still showing two results in SQL studio with the ARMCODE.
If there is a a.CODE_,a.strips from intake it needs to show, if there is an A.ARMCODE and B.DESCRIPTION it needs to show. If there is only A.ARMCODE and B.DESCRIPTION and the other has been deleted why is it still showing two results with a.CODE_ being the second result and an empty a.strips.
select a.ARMCODE,
b.DESCRIPTION_
from ARE.AAS.REORDER a
left outer join ARE.AAS.PTDME b on a.PTCODE=b.CODE_
where a.ARMCODE = 'ADSMANZS03'
and b.MEDICAREID ='A4253'
union all
select a.CODE_,a.strips
from event.dbo.intake a
where a.CODE_ = 'ADSMANZS03'
I started on a new statement using case and am now using some nested joins:
select case when b.ARMCODE is null then a.strips
end
from (select *
from ev.dbo.intake a
where a.CODE_ = 'ADSMANZS03') a
left outer join(select a.ARMCODE,
b.DESCRIPTION_
from ARE.AAS.REORDER a
left outer join ARE.AAS.PTDME b on a.PTCODE=b.CODE_
where a.ARMCODE = 'ADSMANZS03'
and b.MEDICAREID ='A4253') b on a.CODE_=b.ARMCODE
I'm not getting any rows or columns and it's returning (no column name) and inside NULL
Hope that is not too confusing. Thanks in advance.
IMAGE 1 Strips and description, two different products, same patient
IMAGE 2 When i delete strips, still showing two results with empty description, should not show a second result.
IMAGE 3 case statement

Answer 1

Just an fyi so this question can be closed. I used coalesce to determine what i needed.
select
coalesce(b.DESCRIPTION_,a.strips)
from(
select
*
from ev.dbo.intake a
where a.CODE_ = 'ADSMANZS03'
)a
left outer join(
select
a.ARMCODE,
b.DESCRIPTION_
from ARE.AAS.REORDER a
left outer join ARE.AAS.PTDME b on a.PTCODE=b.CODE_
where a.ARMCODE = 'ADSMANZS03'
and b.MEDICAREID ='A4253'
)b on a.CODE_=b.ARMCODE
COALESCE (Transact-SQL)
http://msdn.microsoft.com/en-us/library/ms190349.aspx