[UI] Hide previous Node flows
[UI] Hide previous Node flows

Hide previous node flows when selected node
don't have flows.

Change-Id: I2ed07895af43b28beab5cd755f5a5601367010ab
Reviewed-on: https://softwarefactory-project.io/r/6111
Tested-by: Jenkins CI <d95b56ce41a2e1ac4cecdd398defd7414407cc08@softwarefactory-project.io>
Reviewed-by: Sylvain Afchain <b9baee1c2e4cc202620c6529e0c0bd3dbc38b6dc@gmail.com>
Tested-by: Sylvain Afchain <b9baee1c2e4cc202620c6529e0c0bd3dbc38b6dc@gmail.com>
Workflow: Sylvain Afchain <b9baee1c2e4cc202620c6529e0c0bd3dbc38b6dc@gmail.com>

lebauce/skydive,redhat-cip/skydive,safchain/skydive,lebauce/skydive,lebauce/skydive,safchain/skydive,skydive-project/skydive,skydive-project/skydive,safchain/skydive,lebauce/skydive,lebauce/skydive,safchain/skydive,safchain/skydive,redhat-cip/skydive,safchain/skydive,skydive-project/skydive,lebauce/skydive,safchain/skydive,safchain/skydive,skydive-project/skydive,lebauce/skydive,redhat-cip/skydive,lebauce/skydive,skydive-project/skydive,skydive-project/skydive,skydive-project/skydive