refs #6753 the processed data seems to be ok when comparing them with daily and monthly expected

tests/PHPUnit/System/expected/test_ArchiveCronTest_noOptions__VisitsSummary.get_week.xml

 <?xml version="1.0" encoding="utf-8" ?>
 <results>
-	<result idSite="1" />
+	<result idSite="1">
+		<nb_uniq_visitors>25</nb_uniq_visitors>
+		<nb_users>0</nb_users>
+		<nb_visits>25</nb_visits>
+		<nb_actions>28</nb_actions>
+		<nb_visits_converted>23</nb_visits_converted>
+		<bounce_count>23</bounce_count>
+		<sum_visit_length>305</sum_visit_length>
+		<max_actions>3</max_actions>
+		<bounce_rate>92%</bounce_rate>
+		<nb_actions_per_visit>1.1</nb_actions_per_visit>
+		<avg_time_on_site>12</avg_time_on_site>
+	</result>
 	<result idSite="2" />
 </results>
\ No newline at end of file