Defensively handle loadClass null result in BeanUtils.findEditorByConvention

Closes gh-26252

(cherry picked from commit 2a47751fcd)

spring-beans/src/main/java/org/springframework/beans/BeanUtils.java

@@ -506,6 +506,7 @@ public abstract class BeanUtils {
 		if (targetType == null || targetType.isArray() || unknownEditorTypes.contains(targetType)) {
 			return null;
 		}
+
 		ClassLoader cl = targetType.getClassLoader();
 		if (cl == null) {
 			try {
@@ -522,10 +523,12 @@ public abstract class BeanUtils {
 				return null;
 			}
 		}
+
 		String targetTypeName = targetType.getName();
 		String editorName = targetTypeName + "Editor";
 		try {
 			Class<?> editorClass = cl.loadClass(editorName);
+			if (editorClass != null) {
 				if (!PropertyEditor.class.isAssignableFrom(editorClass)) {
 					if (logger.isInfoEnabled()) {
 						logger.info("Editor class [" + editorName +
@@ -536,7 +539,12 @@ public abstract class BeanUtils {
 				}
 				return (PropertyEditor) instantiateClass(editorClass);
 			}
+			// Misbehaving ClassLoader returned null instead of ClassNotFoundException
+			// - fall back to unknown editor type registration below
+		}
 		catch (ClassNotFoundException ex) {
+			// Ignore - fall back to unknown editor type registration below
+		}
 		if (logger.isTraceEnabled()) {
 			logger.trace("No property editor [" + editorName + "] found for type " +
 					targetTypeName + " according to 'Editor' suffix convention");
@@ -544,7 +552,6 @@ public abstract class BeanUtils {
 		unknownEditorTypes.add(targetType);
 		return null;
 	}
-	}
 
 	/**
 	 * Determine the bean property type for the given property from the