[FIX] base: avoid crash when acessing image without access_token
[FIX] base: avoid crash when acessing image without access_token

- When accessing an image from an "ir.attachment" which doesn't have an
  access_token, the code crashes if you provide the argument access_token
  on the URL.

  This is due to a comparison between a boolean and a string using the
  consteq function.

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