Changed the null keyword to _null_

src/infowindow_exporthandler.js

@@ -124,7 +124,7 @@ export function layerSpecificExportHandler(url, requestMethod, urlParameters, ac
   // an "attribute" property, in which case the value will be a list of the values from the
   // corresponding attribute of the selectedItems. Unless specified with a "separator" property,
   // the list will be separated by semicolons.
-  // Specifying a value as "null" will add a valueless parameter, e g "?Param1&Param2&etc".
+  // Specifying a value as "_null_" will add a valueless parameter, e g "?Param1&Param2&etc".
   let requestUrl = url;
   const requestParams = { ...urlParameters };
   if (requestParams) {
@@ -142,7 +142,7 @@ export function layerSpecificExportHandler(url, requestMethod, urlParameters, ac
     });
     requestUrl = new URL(url);
     requestUrl.search = new URLSearchParams(requestParams);
-    requestUrl = requestUrl.toString().replace(/=null(&|$)/gm, '$1');
+    requestUrl = requestUrl.toString().replace(/=_null_(&|$)/gm, '$1');
   }
 
   if (requestMethod === 'OPEN') {