message: Omit 'unknown' version from app node text
  this is just to make the node more visually pleasing. The unknown label
  value is still visible in the side panel.  This helps make istio ingress
  and some other infra-nodes look better and can better reflect an unset
  version label.
diff: @@ -72,7 +72,7 @@ export class GraphStyles {
  let content = '';
  switch (nodeType) {
  case NodeType.APP:
  - if (getCyGlobalData(ele).graphType === GraphType.APP || ele.data('isGroup')) {
  + if (getCyGlobalData(ele).graphType === GraphType.APP || ele.data('isGroup') || version === 'unknown') {
  content = app;
  } else {
  content = app + `\n${version}`;
  