NPE when writing extra data records with no data

[srikanth-lingala]

@srikanth-lingala @nicolabeghin
I have other problem 。when I add fille in zip ,will get NullPointException. but not All zip .
reappear it steps:

1. download this file http://oss.youxifan.com/MGInc6E .yes it's apk .(apk is a zip)
2. use the add Api code .

    ZipFile zipFile = new ZipFile("/Users/engine/apk/test.apk");
    ArrayList<File> addFiles = new ArrayList<>();
    addFiles.add(new File("/Users/engine/apk/test.txt"));
    ZipParameters parameters = new ZipParameters();
    parameters.setCompressionMethod(CompressionMethod.DEFLATE);
    parameters.setCompressionLevel(CompressionLevel.NORMAL);
    // 目标路径
    parameters.setRootFolderNameInZip("META-INF/");
    zipFile.addFiles(addFiles, parameters);

3. you will get java.lang.NullPointerException and damage the apk

Stack trace:
 net.lingala.zip4j.exception.ZipException: java.lang.NullPointerException
	at net.lingala.zip4j.headers.HeaderWriter.writeFileHeader(HeaderWriter.java:501)
	at net.lingala.zip4j.headers.HeaderWriter.writeCentralDirectory(HeaderWriter.java:382)
	at net.lingala.zip4j.headers.HeaderWriter.finalizeZipFile(HeaderWriter.java:177)
Caused by: java.lang.NullPointerException
	at java.io.OutputStream.write(OutputStream.java:75)
	at net.lingala.zip4j.headers.HeaderWriter.writeRemainingExtraDataRecordsIfPresent(HeaderWriter.java:54
	at net.lingala.zip4j.headers.HeaderWriter.writeFileHeader(HeaderWriter.java:495)
	... 37 more

4. I have fix this Exception by modify HeaderWriter.writeRemainingExtraDataRecordsIfPresent() .at the latest code :

    if(extraDataRecord.getData()!=null){
        outputStream.write(extraDataRecord.getData());
      }

but I'm not sure I'm right

Originally posted by @lovekill in #148 (comment)

[srikanth-lingala]

Issue fixed, will include it in next release

[srikanth-lingala]

Fix included in v2.5.0 released today. A couple of more features have been added in this release. Please have a look at release notes.