null safety

lib/pages/staff/staff_editor.dart

@@ -56,7 +56,7 @@ class _StaffEditorState extends State<StaffEditor> {
           title: InkWell(
         onTap: () {
           setState(() {
-            p.isChecked = p.isChecked == null ? true : !p.isChecked;
+            p.isChecked = p.isChecked == null ? true : !p.isChecked!;
           });
         },
         child: new Row(
@@ -79,10 +79,10 @@ class _StaffEditorState extends State<StaffEditor> {
                 crossAxisAlignment: CrossAxisAlignment.start,
                 children: <Widget>[
                   new Text(
-                    p.name,
+                    p.name ??"",
                     style: TextStyle(fontSize: 15.0, color: primaryColor),
                   ),
-                  Text(p.desc,
+                  Text(p.desc ?? "",
                       style: TextStyle(fontSize: 13, color: Colors.grey[600]))
                 ],
               ),
@@ -151,7 +151,7 @@ class _StaffEditorState extends State<StaffEditor> {
             ? Container()
             : IconButton(
                 icon: Icon(Icons.open_in_new, color: primaryColor),
-                onPressed: () => call(context, user.phoneNumber)),
+                onPressed: () => call(context, user.phoneNumber!)),
       ],
     );
 
@@ -227,7 +227,7 @@ class _StaffEditorState extends State<StaffEditor> {
     });
     StaffModel staffModel = Provider.of<StaffModel>(context, listen: false);
     try {
-      await staffModel.updatePrivileges(this.selectedUser!.id, privilegesIDs());
+      await staffModel.updatePrivileges(this.selectedUser!.id!, privilegesIDs());
       Navigator.pop(context);
     } catch (e) {
       showMsgDialog(context, "Error", e.toString());
@@ -239,7 +239,7 @@ class _StaffEditorState extends State<StaffEditor> {
   }
 
   List<String> privilegesIDs() {
-    return this.privileges.where((p) => p.isChecked).map((p) => p.id).toList();
+    return this.privileges.where((p) => p.isChecked!).map((p) => p.id).toList();
   }
 
   _save() async {
@@ -249,7 +249,7 @@ class _StaffEditorState extends State<StaffEditor> {
     if (widget.staff == null) return;
     StaffModel staffModel = Provider.of<StaffModel>(context, listen: false);
     try {
-      await staffModel.updatePrivileges(widget.staff!.id, privilegesIDs());
+      await staffModel.updatePrivileges(widget.staff!.id!, privilegesIDs());
       Navigator.pop(context);
     } catch (e) {
       showMsgDialog(context, "Error", e.toString());

lib/pages/staff/staff_list.dart

@@ -93,13 +93,13 @@ class _StaffListState extends State<StaffList> {
                       crossAxisAlignment: CrossAxisAlignment.start,
                       children: <Widget>[
                         new Text(
-                          user.name,
+                          user.name ?? "",
                           style: new TextStyle(fontSize: 15.0),
                         ),
                         Padding(
                           padding: const EdgeInsets.only(top: 8.0),
                           child: new Text(
-                            user.phoneNumber,
+                            user.phoneNumber ?? "",
                             style: new TextStyle(
                                 fontSize: 15.0, color: Colors.grey),
                           ),