Add handling for null errorSuite in addErrorSuit method and set filen…

…ame to null and create new Data object in Schema.php.

src/Schema.php

@@ -58,6 +58,9 @@ public function __construct(null|array|string $csvSchemaFilenameOrArray = null)
             }
         } elseif (\is_string($csvSchemaFilenameOrArray)) {
             throw new \InvalidArgumentException("Invalid schema data: {$csvSchemaFilenameOrArray}");
+        } else {
+            $this->filename = null;
+            $this->data     = new Data();
         }
 
         $this->columns = $this->prepareColumns();

src/Validators/ErrorSuite.php

@@ -89,6 +89,10 @@ public function addError(?Error $error): self
 
     public function addErrorSuit(?self $errorSuite): self
     {
+        if ($errorSuite === null) {
+            return $this;
+        }
+
         $this->errors = \array_merge($this->getErrors(), $errorSuite->getErrors());
 
         return $this;