fix : fix base image 判空

app/code/Joshine/Script/Console/Command/ProductFirstImageAsBaseFixer.php

@@ -55,6 +55,16 @@ class ProductFirstImageAsBaseFixer extends Command
         $output->writeln('first image' . $firstImage);
         $output->writeln("main image".$mainImage);
 
+        if (empty($firstImage)) {
+            $output->writeln('first image is null, break');
+            return;
+        }
+
+        if (empty($mainImage)) {
+            $output->writeln('base image is null, break');
+            return;
+        }
+
         if ($mainImage != $firstImage) {
             $output->writeln('fix product ' . $mainImage . ' product id: ' . $productId);
             //change main image