Avoid unresolved reference error when 4way not cracked

Author: WhiteOnBlackCode

wifite/tools/hashcat.py

@@ -27,6 +27,7 @@ def crack_handshake(handshake, show_command=False):
                 handshake, show_command=show_command)
 
         # Crack hccapx
+        key = None  # Avoid unresolved reference when hccapx not cracked
         for additional_arg in ([], ['--show']):
             command = [
                 'hashcat',