utils/web.py: Python 3 should use decode() only if it is a bytes object.

src/utils/web.py

@@ -192,6 +192,7 @@ def htmlToText(s, tagReplace=' '):
     try:
         import chardet.universaldetector
     except ImportError:
+        if sys.version_info[0] < 3 or isinstance(s, bytes):
             s = s.decode('utf8')
     else:
         u = chardet.universaldetector.UniversalDetector()