Update for readAllWebsites and readAllStores methods to check if db table exists before fetch data from table.

Author: ivanko-dev

app/code/Magento/Store/Model/ResourceModel/Store.php

@@ -166,11 +166,16 @@ protected function _changeGroup(\Magento\Framework\Model\AbstractModel $model)
      */
     public function readAllStores()
     {
-        $select = $this->getConnection()
-            ->select()
-            ->from($this->getTable('store'));
+        $stores = [];
+        if ($this->getConnection()->isTableExists($this->getMainTable())) {
+            $select = $this->getConnection()
+                ->select()
+                ->from($this->getTable($this->getMainTable()));
 
-        return $this->getConnection()->fetchAll($select);
+            $stores = $this->getConnection()->fetchAll($select);
+        }
+
+        return $stores;
     }
 
     /**

app/code/Magento/Store/Model/ResourceModel/Website.php

@@ -47,12 +47,14 @@ protected function _initUniqueFields()
     public function readAllWebsites()
     {
         $websites = [];
-        $select = $this->getConnection()
-            ->select()
-            ->from($this->getTable('store_website'));
+        if ($this->getConnection()->isTableExists($this->getMainTable())) {
+            $select = $this->getConnection()
+                ->select()
+                ->from($this->getTable($this->getMainTable()));
 
-        foreach ($this->getConnection()->fetchAll($select) as $websiteData) {
-            $websites[$websiteData['code']] = $websiteData;
+            foreach ($this->getConnection()->fetchAll($select) as $websiteData) {
+                $websites[$websiteData['code']] = $websiteData;
+            }
         }
 
         return $websites;