raise JSONDecodeError("Expecting value", s, err.value) from None

Question

I'm run my code to extract required data from RNA central database based RNAcentral accession number.

Sometimes in the middle, the program stops and start showing this error:

Error Obtained

  File "C:\Users\soura\Desktop\Thesis\Saurav Data\Data_Extraction_RNA_Central.py", line 53, in <module>
    data = page.json()['results']

  File "D:\programs\anaconda3\lib\site-packages\requests\models.py", line 900, in json
    return complexjson.loads(self.text, **kwargs)

  File "D:\programs\anaconda3\lib\json\__init__.py", line 357, in loads
    return _default_decoder.decode(s)

  File "D:\programs\anaconda3\lib\json\decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())

  File "D:\programs\anaconda3\lib\json\decoder.py", line 355, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None

JSONDecodeError: Expecting value

This is the part of my code where I'm having an error

import requests
import time

ids = ['URS0000D57BCE', 'URS0000D57BCE', 'URS0000EEF870', 'URS00009C33DE']

for id in range(len(ids)):
    # Accessing the database cross-reference url with exception handling and extracting info
    page = ''
    while page == '':

        try:
            page = requests.get('http://rnacentral.org/api/v1/rna/{}/xrefs.json'.format(ids[id]))
            break  
        except:
            print('Connection refused by the server at id {} and position {}'.format(ids[id], ids.index(ids[id])))
            print('Lets me sleep for 5 seconds')
            time.sleep(5)
            continue
        
    # Extracting json content from above url
    data = page.json()['results']

Later I modified my code like this but still, I'm getting the same error:

I Changed page = '' to page = None I thought since the error is for the None value of the page. I wrote a while loop in such a way until there is the None value of page, the code will re-run again and again.

import requests
import time

ids = ['URS0000D57BCE', 'URS0000D57BCE', 'URS0000EEF870', 'URS00009C33DE']

for id in range(len(ids)):
    # Accessing the database cross-reference url with exception handling and extracting info
    page = None
    while page == None:

        try:
            page = requests.get('http://rnacentral.org/api/v1/rna/{}/xrefs.json'.format(ids[id]))
            break  
        except:
            print('Connection refused by the server at id {} and position {}'.format(ids[id], ids.index(ids[id])))
            print('Lets me sleep for 5 seconds')
            time.sleep(5)
            continue
        
    # Extracting json content from above url
    data = page.json()['results']

Now, I'm getting this error:

Traceback (most recent call last):
  File "Data_Extraction_RNA_Central.py", line 61, in <module>
    data = page.json()['results']
  File "C:\Users\soura\AppData\Local\Programs\Python\Python37\lib\site-packages\requests\models.py", line 898, in json
    return complexjson.loads(self.text, **kwargs)
  File "C:\Users\soura\AppData\Local\Programs\Python\Python37\lib\json\__init__.py", line 348, in loads
    return _default_decoder.decode(s)
  File "C:\Users\soura\AppData\Local\Programs\Python\Python37\lib\json\decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "C:\Users\soura\AppData\Local\Programs\Python\Python37\lib\json\decoder.py", line 355, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

Please if anyone can help, it will be a great help for me. :-)