No suitable ImageReader found for source data errors about thumbnailator

[goodale]

disregard - root issue was that i was incorrectly using the inputstream twice and it had a file length of zero the second time when calling Thumbnails.

Issue was solved by copying the inputstream using the following (credit to https://stackoverflow.com/questions/5923817/how-to-clone-an-inputstream)

ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len;
while ((len = is.read(buffer)) > -1 ) {
		    baos.write(buffer, 0, len);
}
baos.flush();
InputStream is1 = new ByteArrayInputStream(baos.toByteArray()); 
InputStream is2 = new ByteArrayInputStream(baos.toByteArray()); 	

Possible bug/enhancement suggestion: throw a different exception when the inputstream has zero bytes rather than net.coobird.thumbnailator.tasks.UnsupportedFormatException