bug#41974: 28.0.50; Some vc commands refuse to work when called on non-file buffer

[Dmitry Gutov]

On 23.06.2020 02:38, Juri Linkov wrote:
> >        ((not buffer-file-name)
> > -       (error "Buffer %s is not associated with a file" (buffer-name)))
> > +       (error "Buffer %s is not recognized by any VC backend"
> It seems this code is not necessary anymore because before this code
> gets executed, vc-responsible-backend already signals its error
> "No VC backend is responsible for file".

Even better.