Writing total tracks is throwing an exception

[josdem]

Steps to Reproduce

• Open attached music file
• Complete any data like genre: Chillout
• Click on apply button

Expected behaviour

• Changes applied and status is Updated

Actual result

• Blank status and exception is thrown

Trace

Caused by: java.lang.NumberFormatException: For input string: "null"
	at java.base/java.lang.NumberFormatException.forInputString(NumberFormatException.java:67)
Caused by: java.lang.NumberFormatException: For input string: "null"
	at java.base/java.lang.Integer.parseInt(Integer.java:662)
	at java.base/java.lang.Integer.parseInt(Integer.java:778)
	at org.jaudiotagger.tag.id3.AbstractID3v2Tag.createField(AbstractID3v2Tag.java:1945)
	at org.jaudiotagger.tag.id3.AbstractID3v2Tag.setField(AbstractID3v2Tag.java:415)
	at com.josdem.jmetadata.metadata.MetadataWriter.writeTotalTracksNumber(MetadataWriter.java:131)
	at com.josdem.jmetadata.controller.CompleteController.completeAlbum(CompleteController.java:128)

Attachments
101-miguel_migs_-_so_far.zip