how to validate the null value in dictionary in c#

Question

My code as follows

 

id     Name     farmdetailsdata

1     Test1     {"Product1":"A","Product2":"B"}

2     Test2

3     Test3     {"Product3":"C","Product2":"D"}

4     Test4     {"Product4":"C","Product5":"D"}

 

int columnindex = 43;

List<string> lst = new List<string>();

foreach (DataRow row in dtFarmerFarmReports.Rows)

{

var dict = JsonConvert.DeserializeObject<Dictionary<string, string>>(row["farm_detailsdata"].ToString());

}

 

from the above code how to validate dict is null or empty.

 

becuase in the above table for the ID 2 farmdetailsdata value is empty.

 

from the above code how to validate dict is null or empty.