Merge pull request #12 from webman-tech/11-amis-搜索默认-clear-后会传递空字符串导致-filter-时所有数据都过滤不到

feature: support amis empty string search

Author: krissss

src/Repository/EloquentRepository.php

@@ -107,7 +107,7 @@ protected function buildSearch(EloquentBuilder $query, array $search): EloquentB
     {
         $searchableAttributes = $this->searchableAttributes();
         foreach ($search as $attribute => $value) {
-            if (array_key_exists($attribute, $searchableAttributes)) {
+            if (array_key_exists($attribute, $searchableAttributes) && $value !== '' && $value !== null) {
                 $query = call_user_func($searchableAttributes[$attribute], $query, $value, $attribute);
             }
         }