adding test case which is failing before Thomas' fix, for XML renderer with showColumns one column

tests/PHPUnit/Integration/OneVisitorTwoVisitsTest.php

@@ -130,6 +130,15 @@ class Test_Piwik_Integration_OneVisitorTwoVisits extends IntegrationTestCase
                                                       'showColumns' => 'nb_visits,revenue'
                                                   ))),
 
+            // showColumns with only one column and report having no dimension
+            array('API.getProcessedReport', array('idSite'                 => $idSite, 'date' => $dateTime,
+                                                  'periods'                => 'day', 'apiModule' => 'VisitsSummary',
+                                                  'apiAction'              => 'get',
+                                                  'testSuffix'             => '_showColumns_onlyOne',
+                                                  'otherRequestParameters' => array(
+                                                      'showColumns'        => 'nb_visits'
+                                                  ))),
+
             // test hideColumns w/ expanded=1
             array('Actions.getPageTitles', array('idSite'                 => $idSite, 'date' => $dateTime,
                                                  'periods'                => 'day', 'testSuffix' => '_hideColumns_',
@@ -147,7 +156,7 @@ class Test_Piwik_Integration_OneVisitorTwoVisits extends IntegrationTestCase
                 'idSite'                 => $idSite,
                 'date'                   => $dateTime,
                 'periods'                => 'day',
-                'testSuffix'             => '_showColumns', 
+                'testSuffix'             => '_showColumns',
                 'otherRequestParameters' => array(
                     'showColumns'        => 'nb_uniq_visitors,nb_pageviews,bounce_rate'
                 )

tests/PHPUnit/Integration/expected/test_OneVisitorTwoVisits_showColumns_onlyOne__API.getProcessedReport_day.xml

+<?xml version="1.0" encoding="utf-8" ?>
+<result>
+	<website>new name</website>
+	<prettyDate>Saturday 6 March 2010</prettyDate>
+	<metadata>
+		<category>Visits Summary</category>
+		<name>Visits Summary</name>
+		<module>VisitsSummary</module>
+		<action>get</action>
+		<metrics>
+			<nb_visits>Visits</nb_visits>
+		</metrics>
+		<metricsDocumentation>
+			<nb_visits>If a visitor comes to your website for the first time or if he visits a page more than 30 minutes after his last page view, this will be recorded as a new visit.</nb_visits>
+		</metricsDocumentation>
+		<imageGraphUrl>index.php?module=API&amp;method=ImageGraph.get&amp;idSite=1&amp;apiModule=VisitsSummary&amp;apiAction=get&amp;period=day&amp;date=2010-02-05,2010-03-06</imageGraphUrl>
+		<imageGraphEvolutionUrl>index.php?module=API&amp;method=ImageGraph.get&amp;idSite=1&amp;apiModule=VisitsSummary&amp;apiAction=get&amp;period=day&amp;date=2010-02-05,2010-03-06</imageGraphEvolutionUrl>
+		<uniqueId>VisitsSummary_get</uniqueId>
+	</metadata>
+	<columns>
+		<nb_visits>Visits</nb_visits>
+	</columns>
+	<reportData>
+		<value>2</value>
+	</reportData>
+	<reportMetadata />
+</result>
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