vlkb: bugfix for invalid-arg exception when CTYPEi in header unknown

data-access/engine/src/common/src/cutout.cpp

@@ -177,6 +177,7 @@ string axistype2string(unsigned char cc)
       case 'b': return "BAND"; break;
       case 't': return "TIME"; break;
       case 'p': return "POL"; break;
+      case ' ': return "UNKNOWN"; break;
       default:
          throw invalid_argument(cc + " is not a valid axis type");
    }