separate_arguments: Fix crash on UNIX_COMMAND with no arguments

towrangrequested to merge
Towrang/cmake:separate_arguments_SEG_FAULT into master

I made this change as a by product of trying to compile another open-source-project "neovim" which would not compile. Neovim uses CMake and following the build instructions the build was failing with a "Segmentation Fault".

Fixes: #21320 (closed)
Backport: release
Topic-rename: separate_arguments-no-args

Edited by Brad King

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