fix security issue and filter on active users

internal/identity_bulk.php

@@ -6,6 +6,10 @@ $response = [
 try {
     $inputJSON = file_get_contents('php://input');
     $input = json_decode($inputJSON, TRUE);
+    if (!isset($input)) {
+	throw new Exception('request body is no valid json');
+    }
+
     if (!isset($input["lookup"])) {
         throw new Exception('"lookup" is not defined');
     }
@@ -36,7 +40,6 @@ try {
                 }
 		break;
             case "msisdn":
-                error_log("sb requested a bulk lookup for msisdn");
                 break;
             default:
                 throw new Exception("unknown type for \"by\" param");