Return if queryparams not an object; tidy comments

lib/utils/queryParams.mjs

@@ -1,7 +1,10 @@
 export default _this => {
 
-  // Assign empty object if not defined.
-  _this.queryparams ??= {}
+  // If queryparams is not an object, return.
+  if (typeof _this.queryparams !== 'object') {
+    console.warn('queryparams must be an object')
+    return;
+  };
 
   // The layer queryparam must be true to support viewport params.
   _this.queryparams.layer = _this.queryparams.layer || _this.viewport
@@ -13,7 +16,7 @@ export default _this => {
   let table = _this.queryparams.table === true ? tableCurrent : _this.queryparams.table;
 
   _this.queryparams.table &&= table;
- 
+
   // Assign fieldValues from the location to queryparams.
   if (Array.isArray(_this.queryparams.fieldValues) && _this.location) {
 
@@ -49,20 +52,20 @@ export default _this => {
     // Locale param is only required for layer lookups.
     locale: _this.queryparams.layer && _this.layer.mapview.locale.key,
 
-    // Locale param is only required for layer lookups.
+    // Layer param is only required for layer lookups.
     layer: _this.queryparams.layer && _this.layer.key,
 
     // ID will be taken if a location object is provided with the params.
     id: _this.queryparams?.id && _this.location?.id,
 
-    // lat lng must be explicit or the the center flag param must be set.
+    // lat lng must be explicit or the center flag param must be set.
     lat: center && center[1],
     lng: center && center[0],
 
-    // z will generated if the z flag is set in the params.
+    // z will be generated if the z flag is set in the params.
     z: _this.queryparams?.z && _this.layer.mapview.Map.getView().getZoom(),
 
-    // Viewport will onlcy be generated if the viewport flag is set on the params.
+    // Viewport will only be generated if the viewport flag is set on the params.
     viewport: bounds && [bounds.west, bounds.south, bounds.east, bounds.north, _this.layer.mapview.srid],
 
     // The fieldValues array entries should not be part of the url params.