Fixed following code smells reported by SonarQube:

1) Boolean checks should not be inverted.
 2) Review this redundant assignment.
 3) Extract this nested ternary operation into an independent statement.
 4) Unexpected empty function.
 5) Immediately return this expression instead of assigning it to the temporary variable.

web/pgadmin/static/js/sqleditor/new_connection_dialog_model.js

@@ -250,7 +250,7 @@ export default function newConnectionDialogModel(response, sgid, sid, handler, c
                     },
                   };
                 },
-                build:function() {
+                build:function() { /*This is intentional (SonarQube)*/
                 },
                 prepare:function() {
                   this.setContent(this.message);
@@ -469,6 +469,5 @@ export default function newConnectionDialogModel(response, sgid, sid, handler, c
     },
   });
 
-  let model = new newConnectionModel();
-  return model;
+  return new newConnectionModel();
 }