fixed null project for advanced invoice calculator (#462)

src/Invoice/Calculator/AbstractMergedCalculator.php

@@ -44,6 +44,10 @@ abstract class AbstractMergedCalculator extends AbstractCalculator
             $timesheet->setActivity($entry->getActivity());
         }
 
+        if (null === $timesheet->getProject()) {
+            $timesheet->setProject($entry->getProject());
+        }
+
         if (empty($timesheet->getDescription())) {
             $timesheet->setDescription($entry->getActivity()->getName());
         }

src/Invoice/Renderer/RendererTrait.php

@@ -176,6 +176,7 @@ trait RendererTrait
             'entry.date' => $this->getFormattedDateTime($begin),
             'entry.user_id' => $user->getId(),
             'entry.user_name' => $user->getUsername(),
+            'entry.user_title' => $user->getTitle(),
             'entry.user_alias' => $user->getAlias(),
             'entry.activity' => $activity->getName(),
             'entry.activity_id' => $activity->getId(),