fixes #213 - handle GetColumnNames with empty column row#215
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GetColumnNames() did .begin() + (mRowNameIdx + 1) on the label row without checking that the row has enough elements. When the label row is empty (e.g. after InsertRow on an empty document with LabelParams(0,0)), .begin() wraps a null pointer and adding to it is undefined behavior. Add a bounds check before the iterator arithmetic so it returns an empty vector instead of hitting UB.
…l-row fix GetColumnNames() undefined behavior on empty label row
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Original PR in #214 by @MarkLee131.