fillMergedCells earlier in wb_to_df

[JanMarvin]

if start column is called with fill merged cells, filling can fail with "replacement has 0 elements ..." error. This could be prevented, if the filling is called earlier in the function.

[JanMarvin]

Have to come up with an example. Seen it with SAS XLSX output from proc tabulate.

I assume the issue was that I wanted the last row of a merged column as variable name and wanted to start reading from that row.

The issue might have been that I hadn't imported the upper cells, so wb_to_df was unable to convert the content.

[JanMarvin]

Yet I'm not sure how to circumvent this. The solution might be an internal second wb_to_df call that reads the merged cells only and fills them. So that we always have valid cell content to insert and do not end up with unavailable content.

Though prior to solving this, I'd like to see my initial issue reproduced.