[JENKINS-63541] Don't create empty dirs in chooser #948
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JENKINS-63541 - Don't create empty dirs in chooser
The git plugin previously created an empty directory in the $JENKINS_HOME/caches directory for any repository URL that it checked for size. Those empty directories are not likely to use too much disc space, but a large installation that clones many different repositories will have many empty directories in the caches directory.
Provides a new getCacheDir API that returns null if the directory does not already exist.
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