bug in try-except clause makes header_scan.py impossible to use

[michalmikulasi]

in header_scan.py is this code snippet:

for domain in domains:
        if domain != "":
                try:
                        **_r = requests.head("https://"+domain, timeout=5)_**
                except:
                        print("[-]Error on https://"+domain)
                headers_found = []
                for header in headers:
                        _**current_header = r.headers.get(header.lower())**_
                        if current_header != None and "nginx" not in current_header.lower():
                                headers_found.append(str(current_header))
                if headers_found != []:
                        if is_closed:
                                file = open(output_file,"w+")
                                is_closed = False
                        print("[+]"+domain+" - "+str(headers_found))
                        file.write(domain+" - "+str(headers_found)+"\n")
                else:
                        print("[-]"+domain+" - "+str(headers_found))
        else:

So there is defined variable "r" and the variable is in try-except clause. Later the same variable is referenced again. The problem is, that if the TRY fails, the variable "r" is not defined, and therefore we get error(on the right side of the picture), we get "NameError: name 'r' is not defined"