Check if image field has the URL attribute associated with

models.py

class Products(models.Model):

	# [....]
	
	picture = models.ImageField(upload_to='products', blank=True, null=True)
	picture_2 = models.ImageField(upload_to='products', blank=True, null=True)
	picture_3 = models.ImageField(upload_to='products', blank=True, null=True)
	
	# [....]
	
	@property
	def image_url_1(self):
		if self.picture and hasattr(self.picture, 'url'):
			return self.picture.url
			
	@property
	def image_url_2(self):
		if self.picture_2 and hasattr(self.picture_2, 'url'):
			return self.picture_2.url

	@property
	def image_url_3(self):
		if self.picture_3 and hasattr(self.picture_3, 'url'):
			return self.picture_3.url

template.html

# Then in templates

{{ product.image_url_1|default_if_none:'#'}}
{{ product.image_url_2|default_if_none:'#'}}
{{ product.image_url_3|default_if_none:'#'}}

Inspired by : Django The 'image' attribute has no file associated with it (stack overflow)