more missing bytes encodings

Author: pipermerriam

ethereum/utils.py

@@ -144,7 +144,7 @@ def check_and_strip_checksum(x):
 
 def normalize_address(x, allow_blank=False):
     if allow_blank and (x == '' or x == b''):
-        return ''
+        return b''
     if len(x) in (42, 50) and x[:2] == '0x':
         x = x[2:]
     if len(x) in (40, 48):
@@ -335,7 +335,7 @@ def scan_int(v):
 
 def int_to_hex(x):
     o = encode_hex(encode_int(x))
-    return '0x' + (o[1:] if (len(o) > 0 and o[0] == '0') else o)
+    return b'0x' + (o[1:] if (len(o) > 0 and o[0] == b'0') else o)
 
 
 def remove_0x_head(s):