scrlttr2: Seitenangaben im Fuß unterdrücken bei TotPages=1 ?

%% definition of the custom IMTEK letter foot ================================================
\RequirePackage{totpages}
 
%% Unfortunately, a simple \ifnum .. \else .. \fi does not work:
% \ifnum\value{TotPages}>0
%     \arabic{TotPages} - \theTotPages mehrseitig: \ref{TotPages}
% \else
%     \arabic{TotPages} - \theTotPages einseitig: \ref{TotPages}
% \fi
 
%% from endheads.sty --------------------------------------
% Essentially these routines are code posted by Heiko Oberdiek to 
% comp.text.tex. If you set a counter from a |\pageref|, that 
% |\pageref| is undefined on the first run, and \TeX\ will not only 
% complain about the undefined reference, but give a ``missing 
% number'' error if you try to do anything with that reference, such 
% as compare one page number to another. These commands enable one to 
% use the |\pageref| without generating the missing number error on 
% the first run.
\providecommand*{\ifrefundefined}[1]{%
  \expandafter\ifx\csname r@#1\endcsname\relax
  \expandafter\@firstoftwo
  \else
  \expandafter\@secondoftwo
  \fi
}
\providecommand*{\@extract@ref}[2]{%
  \expandafter\expandafter\expandafter#1\csname
  r@#2\endcsname{}{}\@nil
}
\providecommand*{\@extractref}{%
  \@extract@ref\@car
}
\providecommand*{\@extractpageref}{%
  \@extract@ref\@secondcar
}
 
\long\def\@secondcar#1#2#3\@nil{#2}
 
\providecommand*{\setcounterfromref}[2]{%
  \ifrefundefined{#2}{%
    \protect\G@refundefinedtrue
    \@latex@warning{Reference `#2' on page \thepage \space
      undefined}%
    \setcounter{#1}{0}%
  }{%
    \setcounter{#1}{\@extractref{#2}}%
  }%
}
\providecommand*{\setcounterfrompageref}[2]{%
  \ifrefundefined{#2}{%
    \protect\G@refundefinedtrue
    \@latex@warning{Reference `#2' on page \thepage \space
      undefined}%
    \setcounter{#1}{0}%
  }{%
    \setcounter{#1}{\@extractpageref{#2}}%
  }%
}
\providecommand*{\numberfromref}[2]{%
  \ifrefundefined{#2}{%
    \protect\G@refundefinedtrue
    \@latex@warning{Reference `#2' on page \thepage \space
      undefined}%
    0%
  }{%
    \@extractref{#2}%
  }%
}
\providecommand*{\numberfrompageref}[2]{%
  \ifrefundefined{#2}{%
    \protect\G@refundefinedtrue
    \@latex@warning{Reference `#2' on page \thepage \space
      undefined}%
    0%
  }{%
    \@extractpageref{#2}%
  }%
}
\providecommand*{\@ifonlastpage}[2]{%
  \ifrefundefined{TotPages}{%
    \protect\G@refundefinedtrue
    #2%
  }{%
    \ifnum\thepage=\@extractpageref{TotPages}#1\else #2\fi%
  }%
}
%%---------------------------------------------------------
\providecommand*{\@ifsinglepagedoc}[2]{%
  \ifrefundefined{TotPages}{%
    \protect\G@refundefinedtrue
    #2%
  }{%
    \ifnum\thepage=\@extractpageref{TotPages}#1\else #2\fi%
  }%
}
 
\firstfoot{\strut%
    \makebox[\textwidth][l]{%
	\parbox[t]{\useplength{firstfootwidth}}{%
            \@ifsinglepagedoc{%
	    \hrulefill \quad \raisebox{-1.95mm}{\usekomavar{imtekicon}}
            }{%
            \raisebox{-0.3em}{\usekomafont{pagenumber}\thepage\,/\,\ref{TotPages}} \quad \hrulefill \quad \raisebox{-1.95mm}{\usekomavar{imtekicon}}
            }
	}%end of parbox
    }%end of makebox
}%end of firstfoot
 
%% definition of the custom footer for all other pages but first one
\nextfoot{\hspace*{-\oddsidemargin}\hspace{-1in}%
    \hspace{\useplength{toaddrhpos}}%
    \makebox[\textwidth][l]{%
        \parbox[t]{\useplength{firstfootwidth}}{%
            ~\\[-\dp\strutbox]
            \raisebox{-0.3em}{\usekomafont{pagenumber}\thepage\,/\,\ref{TotPages}} \quad \hrulefill \quad \raisebox{-1.95mm}{\usekomavar{imtekicon}}
        }%end of parbox
    }%end of makebox
}%end of nextfoot
 
%% ACHTUNG: (lt. Doku) \nexthead bzw. \nextfoot nur bei Seitenstil headings (bzw. scrheadings) in Verwendung!
%% Undokumentiert: die Elemente pagehead und pagefoot gelten *nicht* fuer \firsthead und \firstfoot!
\pagestyle{headings}
% --------------------------------------------------------------------------------------------