EZP-22641: Handled asynchronous publishing

Enables asynchronous publishing in ezmultiupload/upload.php

If the uploaded content's publishing workflow is interrupted,
either because of approval, asynchronous publishing, or any
interruption based workflow, there is no node to run node_view_gui on.

If the object has a node, node_view_gui view=line_thumbnail will be used
If it doesn't, content_view_gui with view=line_thumbnail will be used
Merge pull request #12 from ezsystems/backport/EZP-22641-async_publishing

EZP-22641: Handled asynchronous publishing