[BUGFIX] Don't show empty values in UTM diagrams

Classes/Domain/Repository/UtmRepository.php

@@ -115,8 +115,8 @@ public function findCombinedByField(string $field, FilterDto $filter): array
  {
  $connection = DatabaseUtility::getConnectionForTable(Utm::TABLE_NAME);
  $sql = 'select count(utm.' . $field . ') count, utm.' . $field . ' from ' . Utm::TABLE_NAME . ' utm'
- . ' where '
- . $this->extendWhereClauseWithFilterTime($filter, false, 'utm')
+ . ' where ' . $field . ' != \'\''
+ . $this->extendWhereClauseWithFilterTime($filter, true, 'utm')
  . $this->extendWhereClauseWithFilterSearchterms($filter, 'utm', 'utm_source')
  . $this->extendWhereClauseWithFilterSearchterms($filter, 'utm', 'utm_medium', 'or')
  . $this->extendWhereClauseWithFilterSearchterms($filter, 'utm', 'utm_campaign', 'or')
@@ -126,7 +126,7 @@ public function findCombinedByField(string $field, FilterDto $filter): array
  . $this->extendWhereClauseWithFilterCampaign($filter, 'utm')
  . $this->extendWhereClauseWithFilterSource($filter, 'utm')
  . $this->extendWhereClauseWithFilterMedium($filter, 'utm')
- . ' group by utm.' . $field . ' order by count desc limit 10';
+ . ' group by utm.' . $field . ' order by count desc limit 8';
  return $connection->executeQuery($sql)->fetchAllAssociative();
  }