Muted an exception that is raised while searching "ref struct"s for reference

Author: yasirkula

.github/README.md

@@ -68,5 +68,6 @@ void ReplaceFontUsages( Font from, Font to )
 
 - *static* variables aren't searched
 - *Resources.Load* usages can't be found
+- *ref struct*s can't be searched
 - *GUIText* materials aren't searched
 - Textures in *Lens Flares* can't be searched

Plugins/AssetUsageDetector/Editor/AssetUsageDetectorSearchFunctions.cs

@@ -1677,6 +1677,12 @@ private VariableGetterHolder[] GetFilteredVariablesForType( Type type )
 						if( field.FieldType.IsIgnoredUnityType() )
 							continue;
 
+#if UNITY_2021_2_OR_NEWER
+						// "ref struct"s can't be accessed via reflection
+						if( field.FieldType.IsByRefLike )
+							continue;
+#endif
+
 						// Additional filtering for fields:
 						// 1- Ignore "m_RectTransform", "m_CanvasRenderer" and "m_Canvas" fields of Graphic components
 						string fieldName = field.Name;
@@ -1711,6 +1717,12 @@ private VariableGetterHolder[] GetFilteredVariablesForType( Type type )
 						if( property.PropertyType.IsIgnoredUnityType() )
 							continue;
 
+#if UNITY_2021_2_OR_NEWER
+						// "ref struct"s can't be accessed via reflection
+						if( property.PropertyType.IsByRefLike )
+							continue;
+#endif
+
 						// Skip properties without a getter function
 						MethodInfo propertyGetter = property.GetGetMethod( true );
 						if( propertyGetter == null )