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U.xmlToJson() produces emtpy objects when tag is emtpy

See original GitHub issue

I am trying to convert this XML to JSON :

<result>
	<SalHdr>
		<SalId>32745</SalId>
		<BillNo>32745</BillNo>
		<BillDt>2020-09-05T00:00:00</BillDt>
		<BookId>1</BookId>
		<Cash>CA</Cash>
		<BillRefNo>0032745</BillRefNo>
		<PtyId>0</PtyId>
		<PtyName></PtyName> // look here
		<Add1></Add1> // look here
		<City></City> // look here
		<TotAmt>247.61</TotAmt>
		<TaxId>4</TaxId>
		<Taxper>0.00</Taxper>
		<TaxAmt>12.38</TaxAmt>
		<RndOff>0.01</RndOff>
		<NetAmt>260.00</NetAmt>
		<DiscAmt>0.00</DiscAmt>
		<Discper>0.00</Discper>
		<Remarks></Remarks>
		<UserId>2</UserId>
		<CompId>1</CompId>
		<AcYrId>12</AcYrId>
		<DocCancel>0</DocCancel>
		<OtherState>0</OtherState>
		<WaiterId>4</WaiterId>
		<WaiterCode>4</WaiterCode>
		<DeliveryId>0</DeliveryId>
		<Delivery>CASH</Delivery>
		<Est>0</Est>
		<BillTime>2020-09-05T09:08:49</BillTime>
	</SalHdr>
	<SalHdr>
		<SalId>32746</SalId>
		<BillNo>32746</BillNo>
		<BillDt>2020-09-05T00:00:00</BillDt>
		<BookId>1</BookId>
		<Cash>CA</Cash>
		<BillRefNo>0032746</BillRefNo>
		<PtyId>0</PtyId>
		<PtyName></PtyName>
		<Add1></Add1>
		<City></City>
		<TotAmt>404.74</TotAmt>
		<TaxId>4</TaxId>
		<Taxper>0.00</Taxper>
		<TaxAmt>20.24</TaxAmt>
		<RndOff>0.02</RndOff>
		<NetAmt>425.00</NetAmt>
		<DiscAmt>0.00</DiscAmt>
		<Discper>0.00</Discper>
		<Remarks></Remarks>
		<UserId>2</UserId>
		<CompId>1</CompId>
		<AcYrId>12</AcYrId>
		<DocCancel>0</DocCancel>
		<OtherState>0</OtherState>
		<WaiterId>1</WaiterId>
		<WaiterCode>1</WaiterCode>
		<DeliveryId>0</DeliveryId>
		<Delivery>CASH</Delivery>
		<Est>0</Est>
		<BillTime>2020-09-05T09:11:21</BillTime>
	</SalHdr>

Here the PtyName, add1,city is empty . In json I am getting as empty {} instead of emtpy string or null

{
"results" : {
[
{
        "SalId": "32745",
        "BillNo": "32745",
        "BillDt": "2020-09-05T00:00:00",
        "BookId": "1",
        "Cash": "CA",
        "BillRefNo": "0032745",
        "PtyId": "0",
        "PtyName": {}, // look here
        "Add1": {}, // look here
        "City": {}, // look here
        "TotAmt": "247.61",
        "TaxId": "4",
        "Taxper": "0.00",
        "TaxAmt": "12.38",
        "RndOff": "0.01",
        "NetAmt": "260.00",
        "DiscAmt": "0.00",
        "Discper": "0.00",
        "Remarks": {},
        "UserId": "2",
        "CompId": "1",
        "AcYrId": "12",
        "DocCancel": "0",
        "OtherState": "0",
        "WaiterId": "4",
        "WaiterCode": "4",
        "DeliveryId": "0",
        "Delivery": "CASH",
        "Est": "0",
        "BillTime": "2020-09-05T09:08:49",
        "ID": "1"
      },
      {
        "SalId": "32746",
        "BillNo": "32746",
        "BillDt": "2020-09-05T00:00:00",
        "BookId": "1",
        "Cash": "CA",
        "BillRefNo": "0032746",
        "PtyId": "0",
        "PtyName": {},
        "Add1": {},
        "City": {},
        "TotAmt": "404.74",
        "TaxId": "4",
        "Taxper": "0.00",
        "TaxAmt": "20.24",
        "RndOff": "0.02",
        "NetAmt": "425.00",
        "DiscAmt": "0.00",
        "Discper": "0.00",
        "Remarks": {},
        "UserId": "2",
        "CompId": "1",
        "AcYrId": "12",
        "DocCancel": "0",
        "OtherState": "0",
        "WaiterId": "1",
        "WaiterCode": "1",
        "DeliveryId": "0",
        "Delivery": "CASH",
        "Est": "0",
        "BillTime": "2020-09-05T09:11:21",
        "ID": "2"
      }
    ]
]
}

Please help me in this issue since it breaking the model classes