Having extractJSON skip encoding if set to None (happens for empty data)

orthancDatabaseBrowser.py

@@ -11,7 +11,7 @@ def extractJSON(data):
    for x in encodings:
       try:
          return json.loads(data.decode(x))
-      except UnicodeDecodeError:
+      except (UnicodeDecodeError,TypeError):
          pass
 
       print('Failed to decode with [{}]: {}'.format(x,data))