Default N/A option removal for Boolean fields
Closes #3461121
Added a new variable in field_type in OptionsWidgetBase.php to determine the field type. Based on the field type the adding N/A(empty option) is restricted at OptionsButtonWidget.php
Closes #3461121
Added a new variable in field_type in OptionsWidgetBase.php to determine the field type. Based on the field type the adding N/A(empty option) is restricted at OptionsButtonWidget.php