Undefined \@recipientname or \@recipientaddress gives errors

[twsh]

Would it make sense to allow \@recipientname and/or \@recipientaddress to be undefined and print nothing without raising an error?

Looking at moderncvheadstylei.sty, it looks like it could be as simple as:

  % recipient block
  \begin{minipage}[t]{.5\textwidth}
    \raggedright%
    \addressfont%
    \ifthenelse{\isundefined{\@recipientname}}{}{{\bfseries\upshape\@recipientname}\\}%
    \ifthenelse{\isundefined{\@recipientaddress}}{}{\@recipientaddress}%
  \end{minipage}

And so on for the other head styles.