intersphinx fails if intersphinx_mapping not defined.

Michael Forbes avatarMichael Forbes created an issue

If for some reason the user fails to define the intersphinx_mapping dictionary, then intersphinx can fail with an exception on line 201 of that intersphinx_inventory is not a member of env:

    to_try = [(env.intersphinx_inventory, target)]

While this might be considered an error in the configuration, the extension should gracefully handle this, for example, by including the following at line 153:

    if not hasattr(env, 'intersphinx_inventory'):
        env.intersphinx_inventory = {}
    if not hasattr(env, 'intersphinx_named_inventory'):
        env.intersphinx_named_inventory = {}

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