campaignion_action: Reduce logging of missing email addresses

When a form doesn’t have an email field, we should not generate a log
message for each submission, that complains about that.

campaignion_action/campaignion_action.module

@@ -393,7 +393,11 @@ function campaignion_action_campaignion_action_taken($node, Submission $submissi
     $contact = $importer->findOrCreateContact($submission);
   }
   catch (NoEmailException $e) {
-    // Log the missing email address.
+    // If the form doesn’t have an email field, this is expected. Don’t log.
+    if (!$submission->webform->componentByKey('email')) {
+      return;
+    }
+    // Log that the email address was missing.
     $ids = $submission->ids();
     $args = array('@nid' => $ids['nid'], '@sid' => $ids['sid']);
     $msg = "Can't import supporter without email-address for Submission(@nid, @sid).";