Fatal error in VisitsSummary\Controller::getEvolutionGraph()

[sgiehl]

When trying to widgetize the VisitsSummary evolution graph an fatal error occurs:

Recoverable Error: Argument 1 passed to Piwik\Plugins\VisitsSummary\Controller::getEvolutionGraph() must be of the type array, boolean given in /srv/www/htdocs/piwik/plugins/VisitsSummary/Controller.php on line 42 

Error occurs local for superuser. As Guest another error occurs, even for a website with anonymous access. See http://demo.piwik.org/index.php?module=Widgetize&action=iframe&columns[]=nb_visits&widget=1&moduleToWidgetize=VisitsSummary&actionToWidgetize=getEvolutionGraph&idSite=7&period=day&date=yesterday&disableLink=1&widget=1

[sgiehl]

In 9bb6676: fixes #4678 param for view actions has been removed