When using multiple sources in application, image upater is skipping it

[phanisowjanyavutukuri]

when using application with multiple sources, getting the log of image updater as shown below:

"skipping app 'guestbook-test' of type '' because it's not of supported source type" application=guestbook-test

[artemlive]

The issue is a duplicate. There is a pull request opened to address the issue.