Try this instead:

arcpy.AddField_management("wrfd01_layer_intersect","area","DOUBLE","#","#","#","#","NULLABLE","NON_REQUIRED","#")
arcpy.CalculateField_management("wrfd01_layer_intersect","area",expression="!shape.area@squaremeters!","PYTHON_9.3","#")

I think you need to use a DOUBLE instead of LONG to get the desired area values. I suspect your "no values" are roundings of floating point numbers to an integer value of 0 - but I cannot be sure.

To get the above syntax I used Copy As Python Snippet from a successful run of each tool using its tool dialog.

Try this instead:

arcpy.AddField_management("wrfd01_layer_intersect","area","DOUBLE","#","#","#","#","NULLABLE","NON_REQUIRED","#")
arcpy.CalculateField_management("wrfd01_layer_intersect","area","!shape.area@squaremeters!","PYTHON_9.3","#")

I think you need to use a DOUBLE instead of LONG to get the desired area values. I suspect your "no values" are roundings of floating point numbers to an integer value of 0 - but I cannot be sure.

To get the above syntax I used Copy As Python Snippet from a successful run of each tool using its tool dialog.