{{#form-field propertyName
    class="select-field"
    classNames=fieldClasses
    errorClasses=errorClasses
    hintClasses=hintClasses
    inputClasses=inputClasses
    labelClasses=labelClasses
    object=object
    hint=hint
    form=form
    label=label
    control=control
    update=(action update) as |f|}}
  {{f.label required=required}}
  {{f.control
      accesskey=accesskey
      autofocus=autofocus
      dir=dir
      disabled=disabled
      groupLabelPath=groupLabelPath
      hidden=hidden
      lang=lang
      multiple=multiple
      options=options
      optionValuePath=optionValuePath
      optionLabelPath=optionLabelPath
      required=required
      search=search
      tabindex=tabindex
  }}
  {{f.errors}}
  {{f.hint}}
{{/form-field}}

{{#form-field propertyName
    class="select-field"
    classNames=fieldClasses
    errorClasses=errorClasses
    hintClasses=hintClasses
    inputClasses=inputClasses
    labelClasses=labelClasses
    object=object
    hint=hint
    form=form
    label=label
    control=control
    update=(action update) as |f|}}
  {{f.label required=required}}
  {{f.control
      accesskey=accesskey
      autofocus=autofocus
      dir=dir
      disabled=disabled
      groupLabelPath=groupLabelPath
      hidden=hidden
      includeBlank=includeBlank
      lang=lang
      multiple=multiple
      options=options
      optionValuePath=optionValuePath
      optionLabelPath=optionLabelPath
      required=required
      search=search
      tabindex=tabindex
  }}
  {{f.errors}}
  {{f.hint}}
{{/form-field}}

Add the missing includeBlank option
Add the missing includeBlank option
