fix: TransposeCodecInfo.concatenate

Author: bogovicj

src/main/java/org/janelia/saalfeldlab/n5/codec/transpose/TransposeCodecInfo.java

@@ -82,6 +82,8 @@ public static TransposeCodecInfo concatenate(TransposeCodecInfo[] infos) {
 
 		if( infos == null || infos.length == 0)
 			return null;
+		else if (infos.length == 1)
+			return infos[0];
 
 		// copy the initial order so we don't modify to the original
 		int[] order = new int[infos[0].order.length];