Fix "Something is wrong" page in App Store

If a user tries to submit an App that has the same Bundle_SymbolicName and the same Bundle_Version as an App that is already available in the App Store, a screen with an informative error message is supposed to appear.

The page lets the user know that the jar file they tried to upload looks to be a duplicate of an existing release. It says:

Bundle_Version and Bundle_SymbolicName match an already-released App. We are sorry – this is not allowed! If you want users to get the new version, you must increase Bundle_Version. For example, if the released version is 1.0.0, the new version should be 1.0.1 or higher.

See attached image showing what the screen is supposed to look like.

However, this feature is currently broken in the App Store code base, which is deployed to https://testappstore.bioviz.org.

Instead, a blank page appears in the browser. The page code is:

<div class="row">
    <div class="col-md-12 block" id="alerts">
        
        
    </div>
</div>

This needs to be fixed.