accounted for possible emtpy server error message

Author: transistive

src/Databags/Neo4jError.php

@@ -26,12 +26,12 @@
 final class Neo4jError
 {
     private string $code;
-    private string $message;
+    private ?string $message;
     private string $classification;
     private string $category;
     private string $title;
 
-    public function __construct(string $code, string $message, string $classification, string $category, string $title)
+    public function __construct(string $code, ?string $message, string $classification, string $category, string $title)
     {
         $this->code = $code;
         $this->message = $message;
@@ -53,7 +53,7 @@ public static function fromMessageException(MessageException $e): self
      *
      * @throws InvalidArgumentException
      */
-    public static function fromMessageAndCode(string $code, string $message): Neo4jError
+    public static function fromMessageAndCode(string $code, ?string $message): Neo4jError
     {
         $parts = explode('.', $code, 4);
         if (count($parts) < 4) {
@@ -74,7 +74,7 @@ public function getCode(): string
     /**
      * Returns the message of the error.
      */
-    public function getMessage(): string
+    public function getMessage(): ?string
     {
         return $this->message;
     }

src/Exception/Neo4jException.php

@@ -37,7 +37,7 @@ final class Neo4jException extends RuntimeException
     public function __construct(array $errors, Throwable $previous = null)
     {
         $error = $errors[0];
-        $message = sprintf(self::MESSAGE_TEMPLATE, $error->getCode(), $error->getMessage());
+        $message = sprintf(self::MESSAGE_TEMPLATE, $error->getCode(), $error->getMessage() ?? 'NULL');
         parent::__construct($message, 0, $previous);
         $this->errors = $errors;
     }
@@ -63,7 +63,7 @@ public function getNeo4jCode(): string
         return $this->errors[0]->getCode();
     }
 
-    public function getNeo4jMessage(): string
+    public function getNeo4jMessage(): ?string
     {
         return $this->errors[0]->getMessage();
     }

testkit-backend/src/Responses/DriverErrorResponse.php

@@ -23,9 +23,9 @@ final class DriverErrorResponse implements TestkitResponseInterface
 {
     private Uuid $id;
     private string $errorType;
-    private string $message;
+    private ?string $message;
 
-    public function __construct(Uuid $id, string $errorType, string $message)
+    public function __construct(Uuid $id, string $errorType, ?string $message)
     {
         $this->id = $id;
         $this->errorType = $errorType;