Revert "Add tests for non-existent resource"

The code this commit is testing was changed in 0ddeec8, and this test isn't
relevant anymore.

This reverts commit 5c2c13b.

Conflicts:
	ckanext/resourceproxy/tests/test_proxy.py

ckanext/resourceproxy/tests/test_proxy.py

@@ -170,12 +170,3 @@ def test_resource_url_doesnt_proxy_non_http_or_https_urls_by_default(self):
             proxied_url = proxy.get_proxified_resource_url(data_dict, scheme)
             assert non_proxied_url == url, non_proxied_url
             assert proxied_url != url, proxied_url
-
-    def test_non_existent_resource(self):
-        self.data_dict = {'package': {'name': 'doesnotexist'},
-                          'resource': {'id': 'doesnotexist'}}
-
-        proxied_url = proxy.get_proxified_resource_url(self.data_dict)
-        result = self.app.get(proxied_url, status='*')
-        assert result.status == 404, result.status
-        assert 'Resource not found' in result.body, result.body