Brad King 6e59491659 add_custom_{command,target}: Fix crash on empty expanded command ...

Our custom command generation logic assumes that all command lines have
at least `argv0`.  In `add_custom_{command,target}` we already check
that at least a `COMMAND` was given, but using `COMMAND_EXPAND_LISTS` in
combination with a generator expression that expands to an empty string
may produce an empty command line.  In this case simply add an empty
string as a command to maintain our internal invariant.

Fixes: #17993

2018-05-14 11:54:27 -04:00

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