text: Title: !repos command fails with error '''Computer says nooo. See logs for details: b'repo_index' '''
  Body: In order to let us help you better, please fill out the following fields as best you can:
  
  ### I am...
  
  * [ *] Reporting a bug
  * [ ] Suggesting a new feature
  * [ ] Requesting help with running my bot
  * [ ] Requesting help writing plugins
  * [ ] Here about something else
  
  ### I am running...
  
  * Errbot version: 6.1.1
  * OS version: Ubuntu 20.04 LTS
  * Python version: 3.8
  * Using a virtual environment: no
  
  ### Issue description
  
  Please describe your bug/feature/problem here.
  The !repos command is not at all working. 
  
  ```
  GS  10:55 PM
  !repos install https://github.com/Gnoffel/errbot-kudos
  
  bot2APP  10:55 PM
  Installing https://github.com/Gnoffel/errbot-kudos...
  
  10:55
  Computer says nooo. See logs for details:
  b'repo_index'
  
  ```
  Now another output 
  
  ```
  GS  11:00 PM
  !repos
  
  
  
  bot2APP  11:00 PM
  ┏━━━━━━━━┳━━━━━━┳━━━━━━━━━━━━━┓
  ┃ Status ┃ Name ┃ Description ┃
  ┡━━━━━━━━╇━━━━━━╇━━━━━━━━━━━━━┩
  │        │      │             │
  └────────┴──────┴─────────────┘
  ```
  
  
  ### Steps to reproduce
  
  NA
  
  ### Additional info
  
  NA
  