Created attachment 1336388 [details]
screenshot of UI

Description of problem: A composite content view should not have 2 versions of the same component view. But when we tried to add 

Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
1. Create one content view and publish it twice (we have two versions)

# hammer content-view info --id=6
ID:                     6
Name:                   test_view
Label:                  test_view
Composite:              false
Description:
Content Host Count:     0
Organization:           Default Organization
Yum Repositories:
 1) ID:    5
    Name:  sat6tool6
    Label: sat6tool6
Docker Repositories:

OSTree Repositories:

Puppet Modules:

Lifecycle Environments:
 1) ID:   2
    Name: DEV
 2) ID:   1
    Name: Library
Versions:
 1) ID:        7
    Version:   1.0
    Published: 2017/10/09 12:02:37
 2) ID:        8
    Version:   2.0
    Published: 2017/10/09 12:03:50
Components:

Activation Keys:

2. Create a composite content view with one of the content view version as components

# hammer --output=csv content-view create --composite --organization-id="1" --name="composite_CV" --component-ids=
"7"
Message,Id,Name
Content view created,8,composite_CV

3. Now in UI, navigate to Content -> content view -> composite_CV 
4. Click on content views tab
5. Click on add tab

Actual results:
You can see another version of same CV to add.

Expected results:
Add tab should not list CV if one of the version is already added.

Additional info:
Though it list another version from same CV to add, we can't add it to composite CV.It shows error as "An error occurred updating the Content View: is invalid"