"New document" option not available in context menu if Nautilus/Files is run as root && $HOME not active user's home directory

[Ｖ字龍(Vdragon)]

## Bug Reproduce Steps ##
1. Run Nautilus/Files using `gksudo nautilus` or `xhost +SI:localuser:root; sudo --set-home nautilus` (the --set-home or -H command argument is required due to bug #1373495 not fixed)
2. Try to create new document by launching the context menu by right-clicking on the blank part of content view

## Possibly related console warnings ##
```
** (nautilus:4459): CRITICAL **: nautilus_menu_provider_get_background_items: assertion 'NAUTILUS_IS_MENU_PROVIDER (provider)' failed

** (nautilus:4459): CRITICAL **: nautilus_menu_provider_get_background_items: assertion 'NAUTILUS_IS_MENU_PROVIDER (provider)' failed

```

## Note ##
You can't reproduce the bug by directly running `sudo nautilus` command in Ubuntu if you don't workaround bug #1373495 manually in advance.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: nautilus 1:3.10.1-0ubuntu9.11 [modified: usr/share/applications/nautilus.desktop]
ProcVersionSignature: Ubuntu 3.13.0-71.114-generic 3.13.11-ckt29
Uname: Linux 3.13.0-71-generic i686
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: i386
CurrentDesktop: Unity
Date: Sun Dec 13 19:09:38 2015
GsettingsChanges:
 b'org.gnome.nautilus.list-view' b'use-tree-view' b'true'
 b'org.gnome.nautilus.list-view' b'default-column-order' b"['name', 'size', 'type', 'date_modified', 'date_accessed', 'owner', 'group', 'permissions', 'mime_type', 'where', 'RabbitVCS::age_column', 'RabbitVCS::author_column', 'RabbitVCS::revision_column', 'RabbitVCS::status_column']"
InstallationDate: Installed on 2015-10-02 (71 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release i386 (20140417)
SourcePackage: nautilus
UpgradeStatus: No upgrade log present (probably fresh install)

[Sebastien Bacher (seb128)]

Thanks but running nautilus (or other desktop interface) with sudo is not recommended nor supported for security reasons