NullReferenceException errors are thrown continuously on resetting node preset asset.

Steps to repro:
1. Open the attached project > Open Test Scene.
2. Open Test VFX graph.
3. Select & create a preset of "Initialize Particle" node.
4. Reset VFXBasicInitialize asset from the Inspector.

Actual Result:
NullReferenceException errors are thrown in the console.

Expected Result:
No errors in the console.

Reproducible in:
2020.1.0a24(79162fef2e73) & 2019.3.2f1 with Package Version 7.2.0,7.1.8, 7.1.7.
2019.3.0b4 & 2019.3.0a7 with Package Version 7.0.1.

Working fine in:
2019.3.0a6 with Package Version 6.9.2.

Environment:
Occurring on Windows 10 Mac 10.15.

Stack trace:
NullReferenceException: Object reference not set to an instance of an object
UnityEditor.VFX.VFXBasicInitialize.GetSettings (System.Boolean listHidden, UnityEditor.VFX.VFXSettingAttribute+VisibleFlags flags) (at Library/PackageCache/com.unity.visualeffectgraph@7.1.8/Editor/Models/Contexts/Implementations/VFXBasicInitialize.cs:94)
VFXSlotContainerEditor.DoInspectorGUI () (at Library/PackageCache/com.unity.visualeffectgraph@7.1.8/Editor/Inspector/VFXSlotContainerEditor.cs:39)
VFXContextEditor.DoInspectorGUI () (at Library/PackageCache/com.unity.visualeffectgraph@7.1.8/Editor/Inspector/VFXContextEditor.cs:75)
VFXSlotContainerEditor.OnInspectorGUI () (at Library/PackageCache/com.unity.visualeffectgraph@7.1.8/Editor/Inspector/VFXSlotContainerEditor.cs:177)
VFXContextEditor.OnInspectorGUI () (at Library/PackageCache/com.unity.visualeffectgraph@7.1.8/Editor/Inspector/VFXContextEditor.cs:269)
UnityEditor.Presets.PresetEditor.DrawInternalInspector () (at <9ba1187881a84a08b5f9c4cb333d7a6a>:0)
UnityEditor.Presets.PresetEditor.DrawPresetData () (at <9ba1187881a84a08b5f9c4cb333d7a6a>:0)
UnityEditor.Presets.PresetEditor.OnInspectorGUI () (at <9ba1187881a84a08b5f9c4cb333d7a6a>:0)
UnityEditor.UIElements.InspectorElement+<>c__DisplayClass55_0.<CreateIMGUIInspectorFromEditor>b__0 () (at <9ba1187881a84a08b5f9c4cb333d7a6a>:0)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)