title: PouchDB return 404 on design docucment even if this document exist
body: <p>This command ...</p>
  
  <pre><code>this._db.query(`classRoom_ZSFtmZiBu/robots`, {
      classRoomCode: this.classRoomCode,
  }).then(res =&gt; res.rows.map(it =&gt; it.key));
  </code></pre>
  
  <p>Throw 404 error ...</p>
  
  <p><a href="https://i.stack.imgur.com/3U7CD.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/3U7CD.png" alt="enter image description here"></a></p>
  
  <p>Even if the design document exist on database ..</p>
  
  <p><a href="https://i.stack.imgur.com/paNYq.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/paNYq.png" alt="enter image description here"></a></p>
  
  <pre><code>  "_id": "_design/classRoom_ZSFtmZiBu",
    "_rev": "1-667891751ba8a733dc1976172de9b513",
    "views": {
      "robots": {
        "map": "function (doc) {\n                if (doc.type === \"robot\") {\n                  emit(doc);\n                }\n              }"
      }
    },
    "filters": {
      "robotsOnThisClassRoomOnly": "function (doc, req) {\n              return doc.type === \"robot\" &amp;&amp; doc.classRoom === req.query.classRoomCode;\n            }"
    }
  </code></pre>