Webclient start fails if topic ID in URL is invalid

[jri]

The client-side error is:

TopicmapViewmodelError: set_topic_selection(76941) failed. Topic not in topicmap or not visible.

E.g. this happens if you do this:

1. Open a topicmap you have no write permission to.
2. Do a search or reveal any topic through navigation. The revealed topic's ID now appears in the browser URL. Note: DM does not add the topic to the topicmap as you have no write permission.
3. Press browser reload.

For a related (meanwhile solved) problem see #1017.

[Jörg Richter <jri@…>]

In 971b95e0339daedf801dadac72c4b7170609485c/deepamehta:

Webclient launch: check topic ID validity (#1058).

If the topic ID contained in the Webclient launch URL is not valid it is ignored.
The Webclient starts properly. No topic is selected.

A topic ID is regarded valid if all applies:

• The topic is part of the selected topicmap, and is not hidden
• The topic is READable by the current user

See #1058.

[jri]

Fixed in 4.8.5