I’ve updated the OP with Version 1.1 of Add Lines to List:
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If the source draft is empty no content is added to the target list but it can still be loaded and/or previewed.
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The method used to to preview the target list has been changed such that the action ends nornally; thus the action After Success configuration is honored.
Note: Help regarding the Preview was provided by @sylumer, @agiletortoise, and @FlohGro. For more information: End an action, yet still honor the AFTER SUCCESS configuration? - Actions - Help & Questions - Drafts Community