Fix IndexError when parsing GYP files. #1267
Merged
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GYP automatically turns variables ending in _dir, _file or _path into
absolute paths but didn't check for empty strings.
It interacted badly with variables inherited through the environment
from npm, the
scripts-prepend-node-path=false
setting in particularbecause it is turned into
npm_config_script_prepend_node_path=
.Fixes: #1217
CI: https://ci.nodejs.org/job/nodegyp-test-pull-request/32/