[SRP] Fix issue when changing volume profiles at runtime with a script

com.unity.render-pipelines.core/CHANGELOG.md

@@ -12,6 +12,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Added new DebugUI widget types: ProgressBarValue and ValueTuple
 - Added common support code for FSR
 
+### Fixed
+- Fixed issue when changing volume profiles at runtime with a script (case 1364256).
+
 ## [13.1.0] - 2021-09-24
 
 ### Added

com.unity.render-pipelines.core/Editor/Volume/VolumeEditor.cs

@@ -71,6 +71,8 @@ void RefreshEffectListEditor(VolumeProfile asset)
         {
             m_ComponentList.Clear();
 
+            asset.Sanitize();
+
             if (asset != null)
                 m_ComponentList.Init(asset, new SerializedObject(asset));
         }

com.unity.render-pipelines.core/Runtime/Volume/VolumeProfile.cs

@@ -313,5 +313,15 @@ internal int GetComponentListHashCode()
                 return hash;
             }
         }
+
+        /// <summary>
+        /// Removes any components that were destroyed externally from the iternal list of components
+        /// </summary>
+        internal void Sanitize()
+        {
+            for (int i = components.Count - 1; i >= 0; i--)
+                if (components[i] == null)
+                    components.RemoveAt(i);
+        }
     }
 }