Empty schema causes error in Swagger->getArray

[cnizzardini]

Empty schema causing these errors:

Warning: Warning (2): Invalid argument supplied for foreach() in ... src/Lib/Swagger.php, line 99]
Error: [TypeError] uksort() expects parameter 1 to be array, null given in ... src/Lib/Swagger.php on line 111

Sample YML schema:

components:
    schemas:

cakephp-swagger-bake/src/Lib/Swagger.php

Line 99 in decc182

foreach ($this->array['components']['schemas'] as $schema) {

Proposed change:

		if (!empty($this->array['components']['schemas'])) {
			foreach ($this->array['components']['schemas'] as $schema) {
				if (!is_array($schema)) {
					$schema->toArray();
				}
			}
			uksort($this->array['components']['schemas'], function ($a, $b) {
				return strcasecmp(
					preg_replace('/\s+/', '', $a),
					preg_replace('/\s+/', '', $b)
				);
			});
		}

[cnizzardini]

Not supporting 1.x anymore.