Add alert msg when there are no Nodes

Signed-off-by: Tomas Hozza <thozza@gmail.com>
Redirect to the Node details after creation

Signed-off-by: Tomas Hozza <thozza@gmail.com>
Use Node address not Id in the NodeList view

Signed-off-by: Tomas Hozza <thozza@gmail.com>
Add num of records to the sensors list in Node detail view

Signed-off-by: Tomas Hozza <thozza@gmail.com>
The records button in sensors list is enabled only if there are some records

Signed-off-by: Tomas Hozza <thozza@gmail.com>