Merge pull request nus-cs2103-AY2021S1#80 from successs404/branch-delete-grp

Remove empty Group constructor

Author: chunyongg

src/main/java/seedu/address/logic/commands/DelGrpCommand.java

@@ -33,21 +33,18 @@ public DelGrpCommand(GrpContainsKeywordPredicate grpPredicate) {
     public CommandResult execute(Model model) throws CommandException {
         requireNonNull(model);
 
-        Group toDel = new Group();
-
-        boolean hasGroup = false;
+        Group toDel = null;
 
         if (!model.getSerenity().getGroupList().isEmpty()) {
             for (Group group : model.getSerenity().getGroupList()) {
                 if (group.getName().equals(grpPredicate.getKeyword())) {
                     toDel = group;
-                    hasGroup = true;
                     break;
                 }
             }
         }
 
-        if (!hasGroup) {
+        if (toDel == null) {
             throw new CommandException(Messages.MESSAGE_GROUP_EMPTY);
         }
 

src/main/java/seedu/address/model/group/Group.java

@@ -25,9 +25,6 @@ public class Group {
     private UniqueStudentList students;
     private UniqueLessonList lessons;
 
-    // Empty constructor
-    public Group() {}
-
     /**
      * Constructs a {@code Group}
      *