[Devtools] Fixes network group to remove parents if no child

third_party/WebKit/Source/devtools/front_end/network/NetworkLogView.js

Index: third_party/WebKit/Source/devtools/front_end/network/NetworkLogView.js
diff --git a/third_party/WebKit/Source/devtools/front_end/network/NetworkLogView.js b/third_party/WebKit/Source/devtools/front_end/network/NetworkLogView.js
index aecd2030376bc474fe236ac632ba054860d44e3b..b408c94daa1016ebf62d75f9c10c5c399288bd46 100644
--- a/third_party/WebKit/Source/devtools/front_end/network/NetworkLogView.js
+++ b/third_party/WebKit/Source/devtools/front_end/network/NetworkLogView.js
@@ -800,9 +800,6 @@ Network.NetworkLogView = class extends UI.VBox {
       this._timeCalculator.updateBoundaries(request);
       this._durationCalculator.updateBoundaries(request);
 
-      if (node[Network.NetworkLogView._isFilteredOutSymbol] === isFilteredOut)

[pfeldman, 2017/02/16 01:55:14]

offtopic: why do we actually need this symbol at all?

-        continue;
-
       node[Network.NetworkLogView._isFilteredOutSymbol] = isFilteredOut;
       var newParent = this._parentNodeForInsert(node);
       var removeFromParent = node.parent && (isFilteredOut || node.parent !== newParent);
@@ -816,7 +813,7 @@ Network.NetworkLogView = class extends UI.VBox {
         }
       }
 
-      if (isFilteredOut)
+      if (!newParent || isFilteredOut)
         continue;
 
       if (!newParent.dataGrid && !nodesToInsert.has(newParent)) {