fixed extended info for tasks (provide a block for Orocos.name_service.each_task)

Orocos.name_service.each_task requires a block (calling yield), so
Orocos.name_service.each_task.map(&:to_h) fails

Unexpected error while processing request: no block given (yield)

/home/planthaber/dfki/rock/transterra/tools/orocos.rb/lib/orocos/name_service.rb:174:in
`block in each_task'

/home/planthaber/dfki/rock/transterra/tools/orocos.rb/lib/orocos/name_service.rb:169:in
`each'

/home/planthaber/dfki/rock/transterra/tools/orocos.rb/lib/orocos/name_service.rb:169:in
`each_task'

/home/planthaber/dfki/rock/transterra/tools/webapp/lib/rock/webapp/tasks/api.rb:60:in
`block (2 levels) in <class:API>'