fix(extension): 修复 Db 类 count 方法返回值为空时的异常 #6798
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…免返回 null 时抛出空指针异常 - 新增单元测试用例验证 count 方法在查询结果为空时的正确性
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fix: Db.count in extension module produce NullPointerException when query wrapper hit no rows