Fixes crash when URL points to a domain without PTR record

[ph5i]

Hi, I noticed that if the URL provided points to a domain without a PTR record, the gethostbyaddr() function will fail because a reverse DNS lookup can't be performed, ultimately causing the script to crash since exceptions are not handled gracefully.

phsi@wsl:~/tools/OutSystems-Scan/os-scan (*)
> py osscan.py -u https://example.com
[...]
Traceback (most recent call last):
  File "/home/phsi/tools/OutSystems-Scan/os-scan/osscan.py", line 124, in <module>
    exploit_modules(data,environment,app_module_name)
  File "/home/phsi/tools/OutSystems-Scan/os-scan/osscan.py", line 80, in exploit_modules
    get_AppDefinitions.get_app_definitions(environment,app_module_name,header)
  File "/home/phsi/tools/OutSystems-Scan/os-scan/get_AppDefinitions.py", line 40, in get_app_definitions
    print(f"| {Fore.WHITE}Real DNS (enterprise only): {Style.DIM}{get_RealAddress.get_address(environment)}/{app_module_name}{Style.RESET_ALL}")
                                                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/phsi/tools/OutSystems-Scan/os-scan/get_RealAddress.py", line 7, in get_address
    ip_address = socket.gethostbyaddr(host)[0]
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^
socket.herror: [Errno 1] Unknown host

I added basic error handling in get_RealAddress.py to return "Not found!" if no PTR record exists and updated get_AppDefinitions.py slightly for cleaner output.