Resolve #3146351 "Automated drupal 9"

After testing this module on my site, I encountered a few bugs that made it unusable in production. They are included in this merge request, but probably should be abstracted into separated tickets against the byteplant_email_validation module.

They were included here because I was under a tight deadline and did not have the time to split everything apart.

Closes #3146351

src/EmailValidationService.php

@@ -5,10 +5,6 @@ namespace Drupal\byteplant_email_validation;
 use Drupal\Core\Config\ConfigFactoryInterface;
 use GuzzleHttp\Client;
 
-define('BYTEPLANT_OK_VALID_ADDRESS', 200);
-define('BYTEPLANT_OK_CATCH_All_ACTIVE', 207);
-define('BYTEPLANT_OK_CATCH_All_TEST_DELAYED', 215);
-
 /**
  * Class EmailValidationService.
  *
@@ -80,10 +76,16 @@ class EmailValidationService {
    * @return mixed|string
    */
   public function getRequest($url, $options = NULL) {
-    $client = $this->httpClient;
-    $request = $client->get($url, $options);
-    $content = $request->getBody()->getContents();
-    $content = json_decode($content);
+    try {
+      $client = $this->httpClient;
+      $request = $client->get($url, $options);
+      $content = $request->getBody()->getContents();
+      $content = json_decode($content);
+    }
+    catch (\Exception $e) {
+      watchdog_exception('byteplant_email_validation', $e);
+      $content = [];
+    }
     return $content;
   }