Fix JSON-LD data import adds trailing slashes to IRIs
In norm_url leave url alone if it already contains a scheme/protocol.
@@ -59,6 +59,8 @@ def norm_url(base, url):
>>> norm_url('http://example.org/', 'http://example.org//one')
'http://example.org//one'
"""
+ if "://" in url:
+ return url
parts = urlsplit(urljoin(base, url))
path = normpath(parts[2])
if sep != "/":
