SQL Consolidate rows

Hi,
I'm trying to consolidate the rows of this query

select CASE WHEN [type_desc] = 'ROWS' THEN [physical_name] ELSE NULL END as [database_path], CASE WHEN [type_desc] = 'LOG' THEN [physical_name] ELSE NULL END as [log_path] from sys.master_files 
WHERE [database_id] = 13

Select allOpen in new window

database_path      log_path
E:\Microsoft SQL Server\MSSQL12.MSSQLSERVER\MSSQL\DATA\Exchange_2013.mdf      NULL
NULL      L:\Microsoft SQL Server\MSSQL12.MSSQLSERVER\MSSQL\Data\Exchange_2013_log.ldf

Should look like this

database_path                                                                                                                              log_path
E:\Microsoft SQL Server\MSSQL12.MSSQLSERVER\MSSQL\DATA\Exchange_2013.mdf      L:\Microsoft SQL Server\MSSQL12.MSSQLSERVER\MSSQL\Data\Exchange_2013_log.ldf
      
Any help much appreciated

Regards,
M