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bug#30938: 27.0; `dired-do-create-files' etc.: do NOT always raise error

From: Juri Linkov
Subject: bug#30938: 27.0; `dired-do-create-files' etc.: do NOT always raise error if no files
Date: Wed, 28 Mar 2018 23:27:04 +0300
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (x86_64-pc-linux-gnu)

> For example, `dired-do-isearch' could be called non-interactively
> in a context where it should do nothing (or something else should
> be done) if there are no marked files.  Something like this is
> better:
> (defun dired-do-isearch (&optional interactivep)
>   "Search for a string through all marked files using Isearch.
> When invoked interactively, raise an error if no files are marked."
>   (interactive "p")
>   (multi-isearch-files
>    (dired-get-marked-files
>      nil nil 'dired-nondirectory-p nil interactivep)))

Is there a better way than doing the same by adding such a formal arg
to all 12 affected commands?

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