admin.py (a slice)
==================

class PhotoInline(admin.TabularInline):
    # ...

class GalleryAdmin(admin.ModelAdmin):
    inlines = [PhotoInline]
    add_form_template = 'admin/add_without_inlines.html'
    # ...

templates/admin/add_without_inlines.html (full)
===============================================

{% extends "admin/change_form.html" %}

{% block inline_field_sets %}
{% for inline_admin_formset in inline_admin_formsets %}
    {{ inline_admin_formset.formset.management_form }}
{% endfor %}
{% endblock %}