ACP2E-3189: fix static and unit test error

Author: alzota

app/code/Magento/Sales/Model/ResourceModel/Report/Bestsellers.php

@@ -224,11 +224,11 @@ private function getRange(Select $select): array
         if (!isset($this->rangesByQuery[$queryHash])) {
 
             $connection = $this->getConnection();
-            $range = [];
             try {
                 $query = $connection->query($select);
                 $range = $query->fetchAll(\Zend_Db::FETCH_COLUMN);
-            } catch (\Exception $e) {
+            } catch (\Exception) {
+                $range = [];
             }
 
             $this->rangesByQuery[$queryHash] = $range;

app/code/Magento/Sales/Test/Unit/Model/ResourceModel/Report/BestsellersTest.php

@@ -358,11 +358,7 @@ public function testAggregateWithMultipleOrderDatesAndNoDates(
         $connection->expects($this->any())->method('select')->willReturn($select);
         $query = $this->createMock(\Zend_Db_Statement_Interface::class);
         $query->expects($this->once())->method('fetchAll')->willReturn($randomDates);
-        $calls = 3;
-        if ($from && $to) {
-            $calls = 4;
-        }
-        $connection->expects($this->exactly($calls))->method('query')->willReturn($query);
+        $connection->expects($this->exactly(3))->method('query')->willReturn($query);
         $resource = $this->createMock(ResourceConnection::class);
         $resource->expects($this->any())
             ->method('getConnection')