Steps to reproduce:
1. Go to Dashboard
2. Create a Panel
What it happens:
```
Call to phutil_nonempty_string() expected null or a string, got: PhutilURI from PHUIObjectItemView.php:662
19 phorge view/phui/PHUIObjectItemView.php : 662 phutil_nonempty_string()
18 phorge view/AphrontTagView.php : 161 PHUIObjectItemView::getTagContent()
17 phorge view/AphrontView.php : 222 AphrontTagView::render()
16 phorge infrastructure/markup/render.php : 115 AphrontView::producePhutilSafeHTML()
15 phorge infrastructure/markup/render.php : 139 phutil_escape_html()
14 phorge infrastructure/markup/render.php : 139 phutil_escape_html()
13 phorge infrastructure/markup/render.php : 97 phutil_escape_html()
12 phorge infrastructure/javelin/markup.php : 70 phutil_tag()
11 phorge view/AphrontTagView.php : 161 javelin_tag()
10 phorge view/AphrontView.php : 222 AphrontTagView::render()
9 phorge infrastructure/markup/render.php : 115 AphrontView::producePhutilSafeHTML()
8 phorge infrastructure/markup/render.php : 139 phutil_escape_html()
7 phorge infrastructure/markup/render.php : 97 phutil_escape_html()
6 phorge view/AphrontDialogView.php : 466 phutil_tag()
5 phorge aphront/response/AphrontDialogResponse.php : 17 AphrontDialogView::render()
4 phorge applications/base/controller/PhabricatorController.php : 293 AphrontDialogResponse::buildResponseString()
3 phorge aphront/configuration/AphrontApplicationConfiguration.php : 300 PhabricatorController::willSendResponse()
2 phorge aphront/configuration/AphrontApplicationConfiguration.php : 204 AphrontApplicationConfiguration::processRequest()
1 /var/www/phorge/webroot/index.php : 35 AphrontApplicationConfiguration::runHTTPRequest()
```