def get_mimetype(self):
		if self.mimetype:
			return self.mimetype
		return 'text/html'
Alternative implementation of
dataset/ETHPy150Open jarcoal/django-sliver/sliver/views.py/Resource.get_mimetype--crossover with--dataset/ETHPy150Open alimanfoo/petl/petl/transform/setops.py/hashintersection