Replace null check with default

Author: timtebeek

src/main/java/org/openrewrite/java/migrate/UseTabsOrSpaces.java

@@ -54,11 +54,8 @@ public TreeVisitor<?, ExecutionContext> getVisitor() {
             public J visit(@Nullable Tree tree, ExecutionContext ctx) {
                 if (tree instanceof JavaSourceFile) {
                     JavaSourceFile cu = (JavaSourceFile) requireNonNull(tree);
-                    TabsAndIndentsStyle style = Style.from(TabsAndIndentsStyle.class, cu);
-                    if (style == null) {
-                        style = IntelliJ.tabsAndIndents();
-                    }
-                    style = style.withUseTabCharacter(useTabs);
+                    TabsAndIndentsStyle style = Style.from(TabsAndIndentsStyle.class, cu, IntelliJ::tabsAndIndents)
+                            .withUseTabCharacter(useTabs);
                     return new NormalizeTabsOrSpacesVisitor<>(style).visit(tree, ctx);
                 }
                 return (J) tree;