simplified the code and optimization

doc/classes/EditorInterface.xml

@@ -281,7 +281,7 @@
 			<description>
 				Pops up an editor dialog for creating an object.
 				The [param callback] must take a single argument of type [StringName] which will contain the type name of the selected object or be empty if no item is selected.
-				The [param base_type] specifies the base type of objects to display. If you set this to "Resource", all items shown in the create dialog are derived from [Resource].
+				The [param base_type] specifies the base type of objects to display. For example, if you set this to "Resource", all types derived from [Resource] will display in the create dialog.
 				The [param current_type] will be passed in the search box of the create dialog, and the specified type can be immediately selected when the dialog pops up. If the [param current_type] is not derived from [param base_type], there will be no result of the type in the dialog.
 				The [param dialog_title] allows you to define a custom title for the dialog. This is useful if you want to accurately hint the usage of the dialog. If the [param dialog_title] is an empty string, the dialog will use "Create New 'Base Type'" as the default title.
 				The [param type_blocklist] contains a list of type names, and the types in the blocklist will be hidden from the create dialog.

editor/editor_interface.cpp

@@ -537,11 +537,11 @@ void EditorInterface::popup_create_dialog(const Callable &p_callback, const Stri
 	}
 	create_dialog->set_type_suffixes(suffix_map);
 
-	const bool is_type_valid = ClassDB::class_exists(p_base_type) || ScriptServer::is_global_class(p_base_type);
-	if (!is_type_valid) {
+	String safe_base_type = p_base_type;
+	if (p_base_type.is_empty() || (!ClassDB::class_exists(p_base_type) && !ScriptServer::is_global_class(p_base_type))) {
 		ERR_PRINT(vformat("Invalid base type '%s'. The base type has fallen back to 'Object'.", p_base_type));
+		safe_base_type = "Object";
 	}
-	const String safe_base_type = !p_base_type.is_empty() && is_type_valid ? p_base_type : "Object";
 
 	create_dialog->set_base_type(safe_base_type);
 	create_dialog->popup_create(false, true, p_current_type, "");