Do not remove the grooup key as we need it for future operations
Do not remove the grooup key as we need it for future operations

zhangtiny123/angular-multi-select,jtbdevelopment/angular-multi-select,alexandernst/angular-multi-select,jtbdevelopment/angular-multi-select,alexandernst/angular-multi-select,zhangtiny123/angular-multi-select