correctly handle 1 byte ranges

sub/xpat/src/hexdump.rs

@@ -44,15 +44,10 @@ impl<'s, T: Scannable + ?Sized, R: RangeBounds<usize>> Display for HexDump<'s, T
             (start, end)
         };
 
-        // if there is nothing to print then just return...
-        // this also prevents the ilog below from crashing :)
-        if end == 0 || start > end {
-            write!(f,"<empty>");
-            return Ok(())
-        }
-
         // the number of digits the address column should have
-        let digits = (end.ilog(16) as usize + 1).max(4);
+        let digits = if end == 0 { 4 } else {
+            (end.ilog(16) as usize + 1).max(4)
+        };
 
         for (mut addr, chunk) in ChunkIter::new(self.0, start) {
             for chunk in chunk.chunks(16) {