comparators.json: fixup 7b8998e5 for py < 3.6: decode the input if we get that far to try a .load()

Gbp-Dch: Ignore
Signed-off-by: Mattia Rizzolo <mattia@debian.org>

diffoscope/comparators/json.py

@@ -46,8 +46,8 @@ class JSONFile(File):
                 f.seek(0)
 
             try:
-                file.parsed = json.load(
-                    f,
+                file.parsed = json.loads(
+                    f.read().decode('utf-8', errors='ignore'),
                     object_pairs_hook=collections.OrderedDict,
                 )
             except ValueError: