fix: don't change annotated code on finish (#1732)

Remove first empty line break annotation positions, can occur for classes in default package

jadx-core/src/main/java/jadx/api/impl/AnnotatedCodeWriter.java

@@ -154,7 +154,6 @@ public class AnnotatedCodeWriter extends SimpleCodeWriter implements ICodeWriter
 
 	@Override
 	public ICodeInfo finish() {
-		removeFirstEmptyLine();
 		processDefinitionAnnotations();
 		validateAnnotations();
 		String code = buf.toString();

jadx-core/src/main/java/jadx/core/codegen/ClassGen.java

@@ -100,10 +100,12 @@ public class ClassGen {
 		addClassCode(clsBody);
 
 		ICodeWriter clsCode = cls.root().makeCodeWriter();
-		if (!"".equals(cls.getPackage())) {
+		if (cls.getPackage().isEmpty()) {
+			clsCode.add("// default package");
+		} else {
 			clsCode.add("package ").add(cls.getPackage()).add(';');
-			clsCode.newLine();
 		}
+		clsCode.newLine();
 		int importsCount = imports.size();
 		if (importsCount != 0) {
 			List<ClassInfo> sortedImports = new ArrayList<>(imports);