fix: incorrect ID refs in toc nav caused a NullPointerException #1524
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When the `toc` nav of the navigation document contained links pointing to non-existing IDs, checking that links are in reading order caused a NullPointerException. This commit fixes that by using a more defensive programming logic. Fix #1516
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When the
tocnav of the navigation document contained links pointing to non-existing IDs, checking that links are in reading order caused a NullPointerException.This commit fixes that by using a more defensive programming logic.
Fix #1516