database.js fix upload forms

Recent changes to the flow of the client, namely the removal of several calls to model.initClones, seem to have either caused, or brought to light another application flow issue. Where, when the server was returning an indication to the application that it should redirect the user to a new view, the call to the new view was called, but the execution of database.display_result(result) was continued, therefore attempting to identify further formats of potential server responses. Given that in such a context, there may be no samples initialised in the model, the application was crashing, therefore not cotinuing it's execution of the upload form controller initialisation.

This was causing the uploads to never occur. Closes #2849 (closed)