First Name:
@isset($proposal->applicant->firstname) {{$proposal->applicant->firstname}}@endisset

Last Name:
@isset($proposal->applicant->lastname){{$proposal->applicant->lastname}}@endisset

Email:
@isset($proposal->applicant->email){{$proposal->applicant->email}}@endisset

Phone:
@isset($proposal->applicant->mobile_phone){{$proposal->applicant->mobile_phone}}@endisset

Organization info:
@isset($proposal->applicant->organization_info){{$proposal->applicant->organization_info}}@endisset