You can usually...
Select one of the columns.
Hit Edit-->Go to-->Special-->Blanks.
Then hit Edit-->Delete.
Choose Entire Row.
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~Anne Troy
Sort alphabetically, which will group blank cells after filled cells.
If you need to revert back to the order the rows are currently in,
1. Insert a column and number each column;
2. Alpha sort on a column that contains blanks;
3. Delete rows that contain a row number and blanks;
4. Sort on the row number column.