Fixing build.

tests/PHPUnit/Integration/expected/test_noVisit_PeriodIsLast__VisitsSummary.getSumVisitsLengthPretty_day.xml

 <?xml version="1.0" encoding="utf-8" ?>
 <results>
-	<result date="2009-01-04" />
-	<result date="2009-01-05" />
-	<result date="2009-01-06" />
-	<result date="2009-01-07" />
-	<result date="2009-01-08" />
-	<result date="2009-01-09" />
-	<result date="2009-01-10" />
+	<result date="2009-01-04">0s</result>
+	<result date="2009-01-05">0s</result>
+	<result date="2009-01-06">0s</result>
+	<result date="2009-01-07">0s</result>
+	<result date="2009-01-08">0s</result>
+	<result date="2009-01-09">0s</result>
+	<result date="2009-01-10">0s</result>
 </results>
\ No newline at end of file

tests/PHPUnit/Integration/expected/test_noVisit_PeriodIsLast__VisitsSummary.getSumVisitsLengthPretty_week.xml

 <?xml version="1.0" encoding="utf-8" ?>
 <results>
-	<result date="From 2008-12-29 to 2009-01-04" />
-	<result date="From 2009-01-05 to 2009-01-11" />
-	<result date="From 2009-01-12 to 2009-01-18" />
-	<result date="From 2009-01-19 to 2009-01-25" />
-	<result date="From 2009-01-26 to 2009-02-01" />
-	<result date="From 2009-02-02 to 2009-02-08" />
-	<result date="From 2009-02-09 to 2009-02-15" />
+	<result date="From 2008-12-29 to 2009-01-04">0s</result>
+	<result date="From 2009-01-05 to 2009-01-11">0s</result>
+	<result date="From 2009-01-12 to 2009-01-18">0s</result>
+	<result date="From 2009-01-19 to 2009-01-25">0s</result>
+	<result date="From 2009-01-26 to 2009-02-01">0s</result>
+	<result date="From 2009-02-02 to 2009-02-08">0s</result>
+	<result date="From 2009-02-09 to 2009-02-15">0s</result>
 </results>
\ No newline at end of file