ALLNOBLANKROW From the parent table of a relationship, returns all rows but the blank row, or all distinct values of a column but the blank row, and disregards any context filters that might exist.
Syntax
ALLNOBLANKROW( {table | column[, column[, column[,…]]]} )
Parameters
Table- The table over which all context filters are removed.
Column – A column over which all context filters are removed.
Return Value
A table, when the passed parameter was a table, or a column of values, when the passed parameter was a column.
Reference Data
https://docs.microsoft.com/en-us/dax/dax-function-reference