Behave nicely when showing notifications not sent out to any contact

I noticed that there is no output shown for the history views in case no
contact has been notified, but time is short atm...

refs #9009
refs #9430

modules/monitoring/application/views/scripts/list/eventhistory.phtml

@@ -31,6 +31,7 @@ if (count($history) === 0) {
         case 'notify':
           $icon = 'bell';
           $title = $this->translate('Notification');
+          $msg = $msg ?: $this->translate('This notification was not sent out to any contact.');
           break;
         case 'comment':
           $icon = 'comment';

modules/monitoring/application/views/scripts/list/notifications.phtml

@@ -52,6 +52,7 @@ if (count($notifications) === 0) {
                 <br>
                 <?php if (! $this->contact): ?>
                     <small>
+                    <?php if ($notification->notification_contact_name): ?>
                         <?= sprintf(
                             $this->translate('Sent to %s'),
                             $this->qlink(
@@ -60,6 +61,9 @@ if (count($notifications) === 0) {
                                 array('contact_name' => $notification->notification_contact_name)
                             )
                         ) ?>
+                    <?php else: ?>
+                        <?= $this->translate('This notification was not sent out to any contact.'); ?>
+                    <?php endif ?>
                     </small>
                 <?php endif ?>
             </td>

modules/monitoring/application/views/scripts/show/history.phtml

@@ -57,11 +57,11 @@ function contactsLink($match, $view) {
           $title = $this->translate('Notification');
           $stateClass = $isService ? Service::getStateText($event->state) : Host::getStateText($event->state);
 
-          $msg = preg_replace_callback(
+          $msg = $msg ? preg_replace_callback(
               '/^\[([^\]]+)\]/',
               function($match) use ($self) { return contactsLink($match, $self); },
               $msg
-          );
+          ) : $this->translate('This notification was not sent out to any contact.');
           break;
         case 'comment':
           $icon = 'comment';