I am passing a value to a form's init method. I want to return the records that match that value. It is working great except if the value is empty. IF the value is empty then the select returns all records, not just the empty ones. How can I return just the empty ones:

MYFORM.INIT:

LPARAMETERS m.cToolSet
**if no toolset is passed, you are working on the Default header
**similarly, the default header has empty toolsets
IF !EMPTY(m.cToolset)
	thisform.ztoolset=ALLTRIM(m.cToolSet)
ELSE
	thisform.zToolSet=''
ENDIF

LOCAL loCursor
*-- Get a reference to the cursor. 
loCursor = thisform.cmDataManager.getCursor('trpthead')
*-- Just in case the order wasn't correctly set on the cursor.
loCursor.setOrder('ftoolset')
*-- Now, use the cursor's Select method. Way more efficient than a filter.
loCursor.Select(thisform.ztoolset)   && Or whatever value you want to pass.

THISFORM.REQUERY()
THISFORM.REFRESH()

DODEFAULT()