Fix code pointed by Psalm

src/Exception/Reflection/ClassWithoutConstructorException.php

@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Meritoo\Common\Exception\Reflection;
+
+use Exception;
+
+/**
+ * An exception used while given class hasn't constructor
+ *
+ * @author    Meritoo <github@meritoo.pl>
+ * @copyright Meritoo <http://www.meritoo.pl>
+ */
+class ClassWithoutConstructorException extends Exception
+{
+    /**
+     * Creates exception
+     *
+     * @param string $className Fully-qualified name of class that hasn't constructor
+     * @return ClassWithoutConstructorException
+     */
+    public static function create(string $className): ClassWithoutConstructorException
+    {
+        $template = 'Oops, class \'%s\' hasn\'t constructor. Did you use proper class?';
+        $message = sprintf($template, $className);
+
+        return new static($message);
+    }
+}