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da2361ffb3
Since commit 880ca66b51 (Fix: `while()` can silently ignore incorrect
condition, 2021-08-09, v3.22.0-rc1~238^2~4) we correctly reject the
code
set(paren "(")
while(${paren})
endwhile()
However, rejecting it breaks compatibility with projects that used such
code accidentally. In CMake 3.21 and below, any error in the condition
was ignored because the `false` result exited the loop first. Restore
tolerance of the error for now. A policy will be needed to make it an
error later.
Note that the same condition with `if` was always correctly rejected.
Fixes: #22524
Issue: #23296
Co-authored-by: Brad King <brad.king@kitware.com>