If the control is empty when loaded a null reference exception is thrown

[colinrippey]

Line 110:

              userModel = ngModel[0].$modelValue;                                       

This line will set userModel to null if the control has no value.

Line 118:

                 for(var b = 0; b < userModel.length; b++){

This line will throw a null reference exception as userModel is null.

[matthewyarlett]

Just updated the directive. It handles empty models now.