Fix generating empty cache on controller

[gmshake]

ZipExtractionInstaller.performInstallation() will invoke FilePath.installIfNecessaryFrom() to extract tar ball. When there is no connection to the binary_link and the filepath expected exists, no exception will be thrown thus it falls though to generate and send an emptly cache file to the master. Next rounds requests to install the same JDK tool will result in empty tool directory on slave nodes.

Fix that by skip creating empty tool directory on slave nodes.

Testing done

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