没有上传图片时未提交formik图片上传问题表格

如何解决没有上传图片时未提交formik图片上传问题表格

index.js

const handleSubmit = async (value) => {
    const formData = new FormData()
    for (const file of image.product_img) {
        formData.append('product_img',file)
    }
    formData.append('product_name',value.product_name)
    formData.append('category',value.category)
    await Axios.post(`https://localhost:3001/add`,formData,{
        headers: headers
    })
        .then(res => {
            toast.success('Added Successfully!',{
                position: "top-right",hideProgressBar: false,cloSEOnClick: true,pauSEOnHover: true,});
        })
        .catch(e => {
            toast.error('not Added',});
        })
    setTimeout(function () {
        history.push('/')
    },1500);
};

const validationSchema = Yup.object({
    product_name: Yup.string().trim().required('Product name is required'),category: Yup.string().required('Category is required')
});

const formik = useFormik({
    initialValues: request,onSubmit: handleSubmit,validationSchema: validationSchema
});

return (
    <>
        <ToastContainer />
        <form onSubmit={formik.handleSubmit}>
            <div className="form-group">
                <label htmlFor='product_name'>Product Name:</label>
                <input type="text" name="product_name" placeholder="Enter Product Name" className="form-control" 
                onChange={formik.handleChange} onBlur={formik.handleBlur} />
                {
                    formik.touched.product_name && formik.errors.product_name ? (
                        <div className='error'> {formik.errors.product_name} </div>
                    ) : null
                }
            </div>
            <div className="form-group">
                <label htmlFor='category'>Category:</label>
                <select onChange={formik.handleChange} onBlur={formik.handleBlur} className="form-control" name='category' >
                    <option> -- Please Select -- </option>
                    {category.map((it) => {
                        return (
                            <option key={it.id} value={it.id}> {it.category_name} </option>
                        )
                    })}
                </select>
                {
                    formik.touched.category && formik.errors.category ? (
                        <div className='error'> {formik.errors.category} </div>
                    ) : null
                }
            </div>
            <div className="form-group">
                <label htmlFor='product_img'>Product Image:</label> <br />
                <input type="file" multiple name="product_img" id="product_img" onChange={e => handleImageChange(e)} />
            </div>
            <button type="submit" className="btn btn-success" disabled={isSubmitting} > Add </button>
        </form>
    </>
)
};

Formik可以正常工作，但是因为formik不支持图像上传，所以我尝试不带formik来上传图像，并使用formik保留所有表单，当我上传图像时，它可以正常工作，但是当我不上传任何图像时，它给出了错误“无法读取未定义的属性'product_img'”，因为图像字段是可选的。因此，即使没有图像上传，我也希望提交表单。任何帮助都会被申请