Situation:
The STK homepage defines the logo and the print logo. In demo project they are chosen from DMS.
When accessing the demo by the mapped domain name (http://demo-project-author.magnolia-cms.com/), the logo is not displayed anymore.
The code starting point is the call getAssetLink(content, nodeDataPrefix, DAMSupport.VARIATION_ORIGINAL);
So it will serve the image directly from DMS and not from the imaging repo/module.

when looking at the rendered URL, it created an external link based on the defaultBaseURL, see print screen.

Cause:
1. No specific DMS mapping is defined for any site -> the ETKSiteManager falls back to default (instead of current)
2. default site has no domain mapping -> fallback to the DomainNamePathTransformer which uses the defaultBaseURL

Correction:
When no explicit repository mapping in a siteDefinition can be detected, it means that the 'requested' content belongs to all. So the ETKSiteManager should return the current-site and not the default-site.
(Included draft patch created together with Philipp)