Write chart_version only if latest_tag is defined #202
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The chart_version output was written regardless of whether the latest_tag variable was defined. The latest_tag variable is only defined if skip_packaging is not set. This leads to issue #171.
Setting skip_packaging implies that an external process takes care of packaging the chart and setting the chart version. There is thus no need to write the chart_version output as it should already be known.
Closes #171