Fix static analysis CI step error

.gitignore

@@ -23,4 +23,5 @@
 
 ###> phpstan/phpstan ###
 phpstan.*
+!phpstan.dist.neon
 ###< phpstan/phpstan ###

phpstan.dist.neon

@@ -0,0 +1,10 @@
+parameters:
+    level: 6
+    paths:
+        - bin/
+        - config/
+        - public/
+        - src/
+        - tests/
+includes:
+    - phpstan-baseline.neon

src/Factory/RatingFactory.php

@@ -33,7 +33,7 @@ final class RatingFactory extends PersistentObjectFactory
     {
         return [
             'score' => self::faker()->numberBetween(1, 5),
-            'note' => self::faker()->optional()->sentence(),
+            'note' => self::faker()->optional()->sentence() ?? '',
             'subject' => RestaurantFactory::new(),
             'user' => UserFactory::new(),
         ];