Fix \t and \r in dump file (#7766)

Author: swasti16

lib/errorlogger.cpp

@@ -793,6 +793,12 @@ std::string ErrorLogger::toxml(const std::string &str)
         case '\n':
             xml += "
";
             break;
+        case '\t':
+            xml += "	";
+            break;
+        case '\r':
+            xml += "
";
+            break;
         default:
             if (c >= ' ' && c <= 0x7f)
                 xml += c;