A fatal error is thrown on the page allowing to activate pending users.

Error trace:
Fatal error: Uncaught exception 'MustacheException' with message 'Unknown variable: purpose' in /usr/share/tuleap/src/common/templating/mustache/vendor/Mustache.php on line 826
MustacheException: Unknown variable: purpose in /usr/share/tuleap/src/common/templating/mustache/vendor/Mustache.php on line 826
Call Stack
# Time Memory Function Location
1 0.0005 769336 {main}( ) ../approve_pending_users.php:0
2 0.0734 17333984 Tuleap\Admin\AdminPageRenderer->renderAPresenter( ) ../approve_pending_users.php:217
3 0.1055 19741752 Tuleap\Admin\AdminPageRenderer->renderToPage( ) ../AdminPageRenderer.php:48
4 0.1055 19745440 TemplateRenderer->renderToPage( ) ../AdminPageRenderer.php:61
5 0.1055 19745440 MustacheRenderer->renderToString( ) ../TemplateRenderer.class.php:63
6 0.1056 19753576 Mustache->render( ) ../MustacheRenderer.class.php:77
7 0.1056 19753880 Mustache->_renderTemplate( ) ../Mustache.php:207
8 0.1063 19763616 Mustache->_renderTemplate( ) ../Mustache.php:263
9 0.1070 19772184 Mustache->_getVariable( ) ../Mustache.php:246
10 0.1070 19772184 Mustache->_findVariableInContext( ) ../Mustache.php:798