Fix TypeError. Do not call ord() with embty byte object.

tool/dump_tlv.py

@@ -5,27 +5,30 @@
 
 import sys
 
+
 def read_net_32(f):
     a = f.read(1)
-    if a == '':
+    if not a:
         return -1
     b = f.read(1)
-    if b == '':
+    if not b:
         return -1
     c = f.read(1)
-    if c == '':
+    if not c:
         return -1
     d = f.read(1)
-    if d == '':
+    if not d:
         return -1
     return ord(a) << 24 | ord(b) << 16 | ord(c) << 8 | ord(d)
 
+
 def as_hex(data):
     str_list = []
     for byte in data:
         str_list.append("{0:02x} ".format(byte))
     return ''.join(str_list)
 
+
 if len(sys.argv) == 1:
     print('Dump TLV file')
     print('Copyright 2017, BlueKitchen GmbH')
@@ -37,7 +40,6 @@ infile = sys.argv[1]
 
 with open(infile, 'rb') as fin:
     pos = 0
-	try:
     # check header
     magic_0 = read_net_32(fin)
     magic_1 = read_net_32(fin)
@@ -59,6 +61,3 @@ with open (infile, 'rb') as fin:
         pos += len
         print('%04x: ' % tag + as_hex(packet))
     print("Done")
-
-	except TypeError:
-		print ("Error parsing tlv at offset %u (%x)." % (pos, pos))