fix-vertical-metrics.py: fixed linegaps arguements. Previously, the script would not recoginise any linegap arguements, if their value was 0. This is because Python treats 0 as a False statement.
fix-vertical-metrics.py: fixed linegaps arguements. Previously, the script would not recoginise any linegap arguements, if their value was 0. This is because Python treats 0 as a False statement.

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