CRM Fetchxml returns with missing attributes for blank rows

Hello all,

I am using fetchxml query to get results from CRM dynamics however if
my fetchxml is having 6 attributes and query this I get  less than 6
attributes, reason for this, if the row is having blank/null value then
it does not return attribute name, I need the attribute names since I
have written the code to get the attribute names and dynamically get
data from attribute names.
Hers is my code.

Let says my fetchxml contains a string like this(Note: I 'm getting the string dynamically from view name, just showing the string)

string fetchxml= @"<fetch version='1.0' output-format='xml-platform' mapping='logical' distinct='false'><entity name='cdi_postedsurvey'><attribute name='cdi_postedsurveyid' /><attribute name='cdi_name' /><attribute name='createdon' /><order attribute='cdi_name' descending='false' /><filter type='and'><condition attribute='statecode' operator='in'><value>1</value><value>0</value></condition><condition attribute='cdi_postedsurveyid' operator='not-null' /><condition attribute='createdon' operator='on-or-after' value='2016-09-09' /><condition attribute='createdon' operator='on-or-before' value='2016-09-13' /></filter></entity></fetch>";

EntityCollection _viewResult = _orgService.RetrieveMultiple(new FetchExpression(_fetchxml));

 foreach (var e in _viewResult .Entities)   **//Here the entity return less attributes because the row is blank**
                        {
                            if (_keycnt == 0)
                            {
                                foreach (var keys in e.Attributes.Keys)
                                {
                                    _csvData.AppendFormat(keys + ",");  //Get all the Attribute names in comma separted format.
                                }
                                _splitIntoColumn = _csvData.ToString().TrimEnd().Split(',');
                            }
                            _keycnt = 1;
                            _csvData.Remove(_csvData.ToString().LastIndexOf(","), 1);           //Removes comma from the end of the string
                            _csvData.AppendLine();                                              //Enters new line
                            for (int j = 0; j < _splitIntoColumn.Length - 1; j++)
                            {
                                string _attributeName = _splitIntoColumn[j].ToString();
                          //Now get the values based on attribute name
                                if (e.FormattedValues.Contains(_attributeName))
                                {
                                    //append data in csv file
                                }

This is what I 'm getting in my CSV file wherein I have 4 attributes, but I 'm getting 3 because the first row is blank.

cdi_postedsurveyid  createdon   logicalname
A                   14-09-2011       sample
B                   14-09-2011       sample

This is what I want wherein cdi_name is included even if the first row is null

cdi_name  cdi_postedsurveyid    createdon   logicalname
                    A                  14-09-2011       sample
test data       B                  14-09-2011       sample
test data       B                  14-09-2011       sample

Note: Just for your information(not using this library) here the powershell library is fixed for Microsoft.Xrm.Data.PowerShell https://github.com/seanmcne/Microsoft.Xrm.Data.PowerShell/releases