Fixes issues with single folder in document template dialog "Hent dokumentmal"

[olemp]

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Description

Fixes issues with single folder in document template dialog "Hent dokumentmal".

How to test

See #319 for testing details.

• In a project document library make sure there is only one folder
• With 'Hent dokumentmal' select a document and select the newly created folder as target
• Verify that document has been placed in the selcected folder

Relevant issues (if applicable)

Closes #319

[pzljanb]

The solution i sworking, but have a little user issue:
It seems like you need to double-click or something on the folder to enter into the folder you want as target folder.
Only having the folder selected is not enough to have docuements copied into it.
Is this correct behavior, or should anything be corrected her @olemp ?