[I] [Bug] getEdgeByPage(): When the parameter page is not passed，the program reports an error [incubator-hugegraph-ai]

[via GitHub]

chenlixuan opened a new issue, #12:
URL: https://github.com/apache/incubator-hugegraph-ai/issues/12

   ### Bug Type (问题类型)
   
   exception / error (异常报错)
   
   ### Before submit
   
   - [X] I had searched in the 
[issues](https://github.com/apache/hugegraph-toolchain/issues) and found no 
similar issues.
   
   ### Environment (环境信息)
   
   - Server Version: v1.x.x
   - Toolchain Version: v1.x.x
   - Data Size:  xx vertices, xx edges <!-- (like 1000W 点, 9000W 边) -->
   
   
   ### Expected & Actual behavior (期望与实际表现)
   
   
   ```java
   client = PyHugeClient("localhost", "8080", user="admin", pwd="admin", 
graph="test")
   graph = client.graph()
   res = graph.getEdgeByPage("knows")
   ```
   
   the source code:
   ```java
   def getEdgeByPage(self, label=None, vertex_id=None, direction=None, limit=0, 
page=None, properties=None):
           url = f'{self._host}/graphs/{self._graph_name}/graph/edges?'
   
           para = ""
           if vertex_id:
               if direction:
                   para = para + "&vertex_id=\"" + vertex_id + "\"&direction=" 
+ direction
               else:
                   raise NotFoundError("Direction can not be empty.")
           if label:
               para = para + "&label=" + label
           if properties:
               para = para + "&properties=" + json.dumps(properties)
           if page:
                   para += '&page={}'.format(page)
           else:
               para += '&page'
           if limit > 0:
               para = para + "&limit=" + str(limit)
           url = url + para[1:]
           response = self.session.get(url, auth=self._auth, 
headers=self._headers, timeout=self._timeout)
           if check_if_success(response, NotFoundError("not found edges: 
{}".format(response.content))):
               res = []
               for item in json.loads(response.content)["edges"]:
                   res.append(EdgeData(item))
               return res, json.loads(response.content)["page"]
   ```
   the exception occur in the last line "return res, 
json.loads(response.content)["page"]"
   
   ### Vertex/Edge example (问题点 / 边数据举例)
   
   _No response_
   
   ### Schema [VertexLabel, EdgeLabel, IndexLabel] (元数据结构)
   
   _No response_


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