Warning: Undefined array key "" produces an Uncaught TypeError

[l-you]

Jane version(s) affected: 7.5.4

Description
Following error raised after Warning: Undefined array key "" warning.

Fatal error: Uncaught TypeError: Jane\Component\OpenApi3\Generator\Parameter\NonBodyParameterGenerator::convertParameterType(): Return value must be of type array, null returned in /vendor/jane-php/open-api-3/Generator/Parameter/NonBodyParameterGenerator.php:197

How to reproduce
Use following config for generator.

<?php

declare(strict_types=1);

return [
    'openapi-file' => 'https://api.checkbox.in.ua/api/openapi.json',
    'namespace' => 'Vendor\Library\Generated',
    'directory' => __DIR__ . '/generated/checkbox_ua',
];

Possible Solution
I modified code in convertParameterType function as following and it fixed an error.

   $convertArray = [
            'string' => ['string'],
            'number' => ['float'],
            'boolean' => ['bool'],
            'integer' => ['int'],
            'array' => ['array'],
            'file' => ['string', 'resource', '\\' . StreamInterface::class],
        ];

   $convertArray = [
          'string' => ['string'],
          'number' => ['float'],
          'boolean' => ['bool'],
          'integer' => ['int'],
          'array' => ['array'],
          'file' => ['string', 'resource', '\\' . StreamInterface::class],
           ''=>['string']

      ];