Here are two ways to handle this.
Set the shell's
nonomatch
variable. This tells tcsh to leave a pattern unchanged if it doesn't match any files. Thus:% set nonomatch=1 % echo i686.* amd64.* i686.* amd64.*
You will then need to make your commands handle the case of a non-matched pattern.
Pass an extra pattern that always matches. Example:
% echo i686.* amd64.* /dev/nul[l] /dev/null
You will then need to make your commands ignore the file matched by the always-matched pattern. This is probably easier than #1.