X-Frame-Options is obsoleted by CSP frame-ancestors about shcheck

[santoru]

Should be fixed in #42. Thank you

[felmoltor]

I know this issue is closed, but just noticed an error produced by the new code introduced to solve this issue. Not sure what's the trigger, but you can reproduce it by querying www.google.com:

$ ./shcheck.py https://www.google.com/

======================================================
 > shcheck.py - santoru ..............................
------------------------------------------------------
 Simple tool to check security headers on a webserver
======================================================

[*] Analyzing headers of https://www.google.com/
[*] Effective URL: https://www.google.com/
Traceback (most recent call last):
  File ".../shcheck/./shcheck.py", line 23, in <module>
    shcheck.main()
  File ".../shcheck/shcheck/shcheck.py", line 324, in main
    if "Content-Security-Policy".lower() in str(headers).lower() and "frame-ancestors" in headers.get('Content-Security-Policy'.lower()).lower():
AttributeError: 'NoneType' object has no attribute 'lower'

[santoru]

I need to refactor this properly but for the time being should be fixed in v1.6.6