System tests: enable images generation in scheduled reports (#11278)

* System tests: enable images generation in scheduled reports

* prevent error if report does not support multiple periods

* updates expected test files

1 files changed, 2 insertions, 2 deletions

diff --git a/plugins/ImageGraph/API.php b/plugins/ImageGraph/API.php
index ffdd223d46..b596fe6d37 100644
--- a/plugins/ImageGraph/API.php
+++ b/plugins/ImageGraph/API.php
@@ -12,10 +12,10 @@ use Exception;
 use Piwik\API\Request;
 use Piwik\Archive\DataTableFactory;
 use Piwik\Common;
+use Piwik\DataTable\Map;
 use Piwik\Filesystem;
 use Piwik\Period;
 use Piwik\Piwik;
-use Piwik\Plugins\ImageGraph\StaticGraph;
 use Piwik\SettingsServer;
 use Piwik\Translate;
 
@@ -385,7 +385,7 @@ class API extends \Piwik\Plugin\API
             $hasData = false;
             $hasNonZeroValue = false;
 
-            if (!$isMultiplePeriod) {
+            if (!$isMultiplePeriod || !($reportData instanceof Map)) {
                 $reportMetadata = $processedReport['reportMetadata']->getRows();
 
                 $i = 0;