XWIKI-12179: MailSenderScriptService will throw a nullpointerexception if...

XWIKI-12179: MailSenderScriptService will throw a nullpointerexception if there is any issue instead of returning null

  * Bulletproof the API by checking if the result is null before using
    it

xwiki-platform-core/xwiki-platform-mail/xwiki-platform-mail-send/xwiki-platform-mail-send-default/src/main/java/org/xwiki/mail/script/MailSenderScriptService.java

@@ -236,8 +236,10 @@ public ScriptMailResult send(Iterable<? extends MimeMessage> messages, String hi
     {
         ScriptMailResult scriptMailResult = sendAsynchronously(messages, hint);
 
-        // Wait for all messages from this batch to have been sent before returning
-        scriptMailResult.getStatusResult().waitTillProcessed(Long.MAX_VALUE);
+        if (scriptMailResult != null) {
+            // Wait for all messages from this batch to have been sent before returning
+            scriptMailResult.getStatusResult().waitTillProcessed(Long.MAX_VALUE);
+        }
 
         return scriptMailResult;
     }