[turbolizer] View whole graph after phase change

..instead of wrongly keeping the location from the previous view if
the selection became empty after attaching it.

Change-Id: I606010ad86034c2ec06e00c82143a22ca2d88274
Notry: true
Bug: v8:7327
Reviewed-on: https://chromium-review.googlesource.com/c/1407055
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58788}

tools/turbolizer/src/graph-view.ts

@@ -235,7 +235,7 @@ export class GraphView extends View implements PhaseView {
     this.createGraph(data.data, rememberedSelection);
     this.broker.addNodeHandler(this.selectionHandler);
 
-    if (rememberedSelection != null) {
+    if (rememberedSelection != null && rememberedSelection.size > 0) {
       this.attachSelection(rememberedSelection);
       this.connectVisibleSelectedNodes();
       this.viewSelection();