SMSc : Default image is not shown in landing page when the image is disabled earlier

----------------
Env: yell-dev-mms1.ri.thesearchagency.com
SMSc Ver: 3.5
---------------

Steps:
1. Log into SMSc application by providing valid credentials (username,password & SAPiD)
2. Under the 'landing page campaign settings' tab, click on the [edit] link of the "Image"
3. In the "Custom Image for Campaign" dialog box , select "Disable Image" button
4. After changes are saved, run a request and browse to SEM page
"http://yell-dev-mms1.ri.thesearchagency.com/sites/www.gptest52.com/sem-incometaxreading.html"
=> Observed there is no image displayed in the SEM page as expected
5. Now in 'Landing Page Campaign Settings' tab, click on the [default] link of the "Image" to set the
image to default
6. After changes are saved, run a request and browse to SEM page
"http://yell-dev-mms1.ri.thesearchagency.com/sites/www.gptest52.com/sem-incometaxreading.html"

Expected Result:
The default landing page image should be displayed in the SEM page

Actual Result:
No default images is shown in the SEM page and it looks that the images are disabled in landing page

Note:
1. When a image is selected earlier in "landing page campaign" settings, default landing page image is
displayed as expected
2. Also observed the same issue in SMSc-3.0