fix(#87): allow getMessagesDescriptionsAndCodes for single Error

Author: annuh

src/Exception/CifException.php

@@ -64,6 +64,14 @@ public function __construct($message = '', int $code = 0, \Throwable $previous =
                 $message .= ' (' . $this->messages[0]['description'] . ')';
             }
             $code = $this->messages[0]['code'];
+        } else {
+            $this->messages = [
+                [
+                    'message'     => $message,
+                    'description' => $message,
+                    'code'        => $code,
+                ],
+            ];
         }
 
         parent::__construct(message: $message, code: $code, previous: $previous);

src/Service/ResponseProcessor/Rest/AbstractRestResponseProcessor.php

@@ -109,7 +109,7 @@ protected function validateResponse(ResponseInterface $response): bool
             }
             throw new CifException(message: $exceptionData);
         } elseif (!empty($body->Error)) {
-            throw new CifException(message: (string) $body->Error->ErrorDescription, code: (int) $body->Error->ErrorCode);
+            throw new CifException(message: (string) ($body->Error->ErrorMessage ?? ''), code: (int) ($body->Error->ErrorCode ?? 0));
         } elseif (!empty($body->Array->Item->ErrorMsg)) {
             // {"Array":{"Item":{"ErrorMsg":"Unknown option GetDeliveryDate.Options='DayTime' specified","ErrorNumber":26}}}
             $exceptionData = [