Added test and query call

endpoints/cleargroup.js

@@ -4,8 +4,10 @@ const handleClearGroup = (req, res, db) => {
     //Parsing req body 
     const { reqgroup} =req.body;
     //Checking for groupname in table groups and deleting users
-    db('groups')
+     db('groups')
         .where('groupname', 'ilike', reqgroup)
+        //Group initialization is maintained
+        .andWhereNot('username', '')
         .del()
         .then (count => {
             if (count!==0) {