inline_all_toctrees() contains a non-specific except block that masks other issues.

[liffiton]

Problem

I'm using an extension that fails when using singlehtml, raising an exception during util/nodes.py:inline_all_toctrees(). The extension's node class doesn't play nice with _new_copy(), apparently. The exception is caught by the bare except Exception: line in util/nodes.py:inline_all_toctrees(), emitting a warning that a referenced document does not exist, even though the document does exist and the error is something else entirely.

Expected results

I think ideally this except block would only trigger on Exceptions that actually result from nonexistent files, letting all other exceptions bubble up.

[tk0miya]

+0; I don't think this is a bug. But it is reasonable.