fix(gui): flatten packages view: non-leaf packages with classes were not visible in the sources tree (PR #2450)

fix(gui): Flatten packages view: non-leaf packages with classes were not visible in the sources tree

Author: jpstotz

jadx-gui/src/main/java/jadx/gui/utils/pkgs/PackageHelper.java

@@ -75,7 +75,7 @@ public List<JRenamePackage> getRenameNodes(JPackage pkg) {
 	private List<JPackage> prepareFlatPackages() {
 		List<JPackage> list = new ArrayList<>();
 		for (JavaPackage javaPkg : wrapper.getPackages()) {
-			if (javaPkg.isLeaf()) {
+			if (javaPkg.isLeaf() || !javaPkg.getClasses().isEmpty()) {
 				JPackage pkg = buildJPackage(javaPkg, false);
 				pkg.setName(javaPkg.getFullName());
 				list.add(pkg);