When editing a landing page in eZ Studio, if we delete the draft then the complete object will be deleted instead.

Steps to reproduce:
1. Go to an existing landing page with no drafts (Page -> Siteaccess -> Landing page)
2. Push Edit
3. Push "Delete draft"
4. The complete object gets deleted.

Request results:

Request:

GET /site/Test-Page HTTP/1.1
Host: ezenterprise15.local
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:41.0) Gecko/20100101 Firefox/41.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
DNT: 1
Referer: http://ezenterprise15.local/ez
Cookie: eZSESSID=669koeupl3hkogp9e5v0fo9il6; eZSESSID98defd6ee70dfb1dea416cecdf391f58=jm6u6mvurmgu0q67t2qqpcjld7
Connection: keep-alive

Response:

HTTP/1.1 404 Not Found
Date: Tue, 04 Oct 2016 10:50:44 GMT
Server: Apache/2.4.18 (Ubuntu)
Cache-Control: private
Vary: X-User-Hash
Content-Length: 471
Keep-Alive: timeout=5, max=97
Connection: Keep-Alive
Content-Type: text/html; charset=UTF-8

Request:

GET /studio/urlaliasinfo?url=%2Fsite%2FTest-Page HTTP/1.1
Host: ezenterprise15.local
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:41.0) Gecko/20100101 Firefox/41.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
DNT: 1
X-Requested-With: XMLHttpRequest
X-Siteaccess: site
Referer: http://ezenterprise15.local/ez
Cookie: eZSESSID=669koeupl3hkogp9e5v0fo9il6; eZSESSID98defd6ee70dfb1dea416cecdf391f58=jm6u6mvurmgu0q67t2qqpcjld7
Connection: keep-alive

Response:

HTTP/1.1 404 Not Found
Date: Tue, 04 Oct 2016 10:50:46 GMT
Server: Apache/2.4.18 (Ubuntu)
Cache-Control: private
Vary: X-User-Hash
Content-Length: 23
Keep-Alive: timeout=5, max=94
Connection: Keep-Alive
Content-Type: application/json