Custom template shown with 'Linked image not found' in File > New from template
#### Steps to reproduce: - open Inkscape - add a vector object into the file for easier recognition later - File > Save template - Add a name (other fields are not required - Save - now I want to use the new template: File > New from Template - select the previously saved file #### What happened? The preview shows the file like this: ![Bildschirmfoto_2019-02-20_22-16-12](/uploads/8c11f991dbf32bb2db0963ac8069b68e/Bildschirmfoto_2019-02-20_22-16-12.png) The commandline complains with this, when I select the template: `SPDocument::doUnref(): invalid ref count! -1` On Windows, the preview is just missing (all grey). It works correctly in Inkscape 0.92.4. #### What should have happened? It should have used the SVG preview that we also use in other dialogs. There is no bitmap image in my template that could be missing. #### Inkscape Version and Operating System: - Inkscape Version: 1.0alpha (b442a4dd31, 2019-02-17) - Operating System: Linux Mint - Operating System version: 19.1
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