Optionnal quote because the frontend does not use it

src/Wallabag/AnnotationBundle/Entity/Annotation.php

@@ -60,7 +60,6 @@ class Annotation
     /**
      * @var string
      *
-     * @Assert\NotNull()
      * @Assert\Length(
      *     max = 10000,
      *     maxMessage = "validator.quote_length_too_high"

src/Wallabag/AnnotationBundle/Form/NewAnnotationType.php

@@ -17,7 +17,7 @@ class NewAnnotationType extends AbstractType
                 'empty_data' => '',
             ])
             ->add('quote', null, [
-                'empty_data' => null,
+                'empty_data' => '',
                 'trim' => false,
             ])
             ->add('ranges', CollectionType::class, [

src/Wallabag/ApiBundle/Controller/AnnotationRestController.php

@@ -37,8 +37,8 @@ class AnnotationRestController extends WallabagRestController
      * @ApiDoc(
      *      requirements={
      *          {"name"="ranges", "dataType"="array", "requirement"="\w+", "description"="The range array for the annotation"},
-     *          {"name"="quote", "dataType"="string", "required"=true, "description"="Quote for the annotation"},
-     *          {"name"="text", "dataType"="string", "required"=true, "description"=""},
+     *          {"name"="quote", "dataType"="string", "description"="The annotated text"},
+     *          {"name"="text", "dataType"="string", "required"=true, "description"="Content of annotation"},
      *      }
      * )
      *