Fix up PHPStan issues.

Author: dereuromark

src/Annotator/ClassAnnotatorTask/FormClassAnnotatorTask.php

@@ -42,6 +42,10 @@ public function shouldRun(string $path, string $content): bool {
 	 */
 	public function annotate(string $path): bool {
 		preg_match('#\buse (\w+)\\\\Form\\\\(.+)Form\b#', $this->content, $matches);
+		if (empty($matches[1]) || empty($matches[2])) {
+			return false;
+		}
+
 		$appNamespace = $matches[1];
 		$name = $matches[2] . 'Form';
 

src/Annotator/Traits/ModelTrait.php

@@ -23,7 +23,7 @@ protected function getUsedModels(string $content): array {
 		$models = array_combine($properties, $tables);
 
 		preg_match_all('/\b(public|protected|private) \$([a-z]+)\b/i', $content, $propertyMatches);
-		$excluded = $propertyMatches[2] ?? [];
+		$excluded = $propertyMatches[2];
 		foreach ($excluded as $property) {
 			if (isset($models[$property])) {
 				unset($models[$property]);