Describe query not working when url is encoded

[GCHQDeveloper81]

When IRI is encoded (e.g. has URL encoding applied) then the describe query in the explore pages stops returning results.

Steps to reproduce the behavior:

Import the following graph as a local data source.

@prefix foaf: <http://xmlns.com/foaf/0.1/> .

<http://www.example.com/Bob> foaf:knows <http://www.example.com/Alice> .
<http://www.example.com/Bob%20Smith> foaf:knows <http://www.example.com/Alice%20Jones> .

Click Show / Sample data - you can see that both triples are in the local store.

• Click through to Bob - you can see that they know Alice
• Click thorugh to Bob%20Smith - the property about them knowing Alice%20Jones does not exist.

The latter should show that Bob%20Smith knows Alice%20Jones.

This is probably caused by the fact that the IRI being described is stored in the querystring of the DESCRIBE page's URL and being decoded incorrectly - needs investigation.

Fix should be accompanied by appropriate unit/e2e tests.