Fix zero size tag exception

pom.xml

@@ -10,7 +10,7 @@
 
 	<groupId>com.mpatric</groupId>
 	<artifactId>mp3agic</artifactId>
-	<version>0.9.2-SNAPSHOT</version>
+	<version>0.9.3</version>
 	<name>mp3agic</name>
 	<description>A java library for reading mp3 files and manipulating mp3 file ID3 tags (ID3v1 and ID3v2.2 to
 		ID3v2.4).

src/main/java/com/mpatric/mp3agic/AbstractID3v2Tag.java

@@ -154,7 +154,7 @@ private int unpackHeader(byte[] bytes) throws UnsupportedTagException, InvalidDa
 		unpackFlags(bytes);
 		if ((bytes[FLAGS_OFFSET] & 0x0F) != 0) throw new UnsupportedTagException("Unrecognised bits in header");
 		dataLength = BufferTools.unpackSynchsafeInteger(bytes[DATA_LENGTH_OFFSET], bytes[DATA_LENGTH_OFFSET + 1], bytes[DATA_LENGTH_OFFSET + 2], bytes[DATA_LENGTH_OFFSET + 3]);
-		if (dataLength < 1) throw new InvalidDataException("Zero size tag");
+//		if (dataLength < 1) throw new InvalidDataException("Zero size tag");
 		return HEADER_LENGTH;
 	}
 

src/test/java/com/mpatric/mp3agic/Mp3FileTest.java

@@ -15,6 +15,7 @@
 public class Mp3FileTest {
 
 	private static final String fs = File.separator;
+	private static final String MP3_NEVER_TAGGED = "src" + fs + "test" + fs + "resources" + fs + "never-tagged.mp3";
 	private static final String MP3_WITH_NO_TAGS = "src" + fs + "test" + fs + "resources" + fs + "notags.mp3";
 	private static final String MP3_WITH_ID3V1_AND_ID3V23_TAGS = "src" + fs + "test" + fs + "resources" + fs + "v1andv23tags.mp3";
 	private static final String MP3_WITH_DUMMY_START_AND_END_FRAMES = "src" + fs + "test" + fs + "resources" + fs + "dummyframes.mp3";
@@ -33,6 +34,8 @@ public void shouldLoadMp3WithNoTags() throws IOException, UnsupportedTagExceptio
 		loadAndCheckTestMp3WithNoTags(new File(MP3_WITH_NO_TAGS), 256);
 		loadAndCheckTestMp3WithNoTags(new File(MP3_WITH_NO_TAGS), 1024);
 		loadAndCheckTestMp3WithNoTags(new File(MP3_WITH_NO_TAGS), 5000);
+
+		loadAndCheckTestMp3NeverTagged(MP3_NEVER_TAGGED);
 	}
 
 	@Test
@@ -356,6 +359,11 @@ private Mp3File copyAndCheckTestMp3WithUnicodeFields(Mp3File mp3File) throws Not
 		}
 	}
 
+	private Mp3File loadAndCheckTestMp3NeverTagged(String filename) throws IOException, UnsupportedTagException, InvalidDataException {
+		Mp3File mp3File = new Mp3File(filename);
+		return mp3File;
+	}
+
 	private Mp3File loadAndCheckTestMp3WithNoTags(String filename, int bufferLength) throws IOException, UnsupportedTagException, InvalidDataException {
 		Mp3File mp3File = loadAndCheckTestMp3(filename, bufferLength);
 		return loadAndCheckTestMp3WithNoTags(mp3File);