more fixes

Author: David Maloney

modules/exploits/windows/winrm/winrm_powershell.rb

@@ -63,6 +63,10 @@ def check
 			print_error "Login failed!"
 			return Msf::Exploit::CheckCode::Safe
 		end
+		unless streams.class == Hash 
+			print_error "Recieved error while running check"
+			return Msf::Exploit::CheckCode::Safe
+		end
 		streams = winrm_run_cmd("powershell Get-ExecutionPolicy")
 		if streams['stdout'].include? 'Unrestricted'
 			return Msf::Exploit::CheckCode::Vulnerable