Fetch model names for when its is missing

Sometimes we have URLs that does not contain the name parameter. In such case, the client display nothing which is weird.
I think the client should use in this case the name of the model.

assigned to @ced

added sao tryton type::feature + 1 deleted label

added 1 deleted label and removed 1 deleted label

review300381002 updated at https://codereview.tryton.org/300381002/#ps304261002

review300381002 updated at https://codereview.tryton.org/300381002/#ps318241002

review300381002 updated at https://codereview.tryton.org/300381002/#ps290981002

New changeset e0fec0981c12 by Cédric Krier in branch 'default':
Fallback to model name as title
https://hg.tryton.org/sao/rev/e0fec0981c12

added 1 deleted label and removed 1 deleted label

closed

New changeset 60b4dc6f3da9 by Cédric Krier in branch 'default':
Fallback to model name as title
https://hg.tryton.org/tryton/rev/60b4dc6f3da9

New changeset 75402881aefc by Cédric Krier in branch 'default':
Fallback to model name as title
https://hg.tryton.org/trytond/rev/75402881aefc

New changeset 22c1029cde10 by Cédric Krier in branch 'default':
Fallback to model name as title
https://hg.tryton.org/tryton-env/rev/22c1029cde10