Account for existing but empty cpus file

If a CPU file exists but is empty, previously we reported this file with a CPU count of 1, which resulted in a single-threaded run. This change trims whitespace from the file, and makes sure that the length of any token in the file is greater than 0 before incrementing the CPU count variable. This will (correctly) report the file with a CPU count of 0, and the result will be filtered out as expected.
github · Feb 15, 2024 · 8275137 · 8275137
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -6,7 +6,7 @@ Note that the only difference between `v2` and `v3` of the CodeQL Action is the
 
 ## [UNRELEASED]
 
-No user facing changes.
+- Fix an issue where an existing, but empty, `/sys/fs/cgroup/cpuset.cpus` file always resulted in a single-threaded run. [#2151](https://github.com/github/codeql-action/pull/2151)
 
 ## 3.24.3 - 15 Feb 2024
 

diff --git a/lib/util.js b/lib/util.js