text: Title: Edge case: `xonsh --no-rc --no-env`: `TERM environment variable not set`
  Body: ```xsh
  xonsh --no-rc --no-env 
  clear
  # TERM environment variable not set
  ```
  We need to have default TERM in `--no-env` if it's needed or close this issue with clarification why we don't.
  
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