varDefZaxis: don't remove default of longname and units.

ChangeLog

+2018-02-12  Uwe Schulzweida
+
+	* varDefZaxis: don't remove default of longname and units
+
 2018-02-03  Uwe Schulzweida
 
 	* Fix brocken ECHAM5 modelIDs (introduced in 1.9.3)

src/varscan.c

@@ -1019,9 +1019,9 @@ int varDefZaxis(int vlistID, int zaxistype, int nlevels, const double *levels, c
 
 	  if ( name && name[0] ) zaxisDefName(zaxisID, name);
 	  if ( longname && longname[0] ) zaxisDefLongname(zaxisID, longname);
-          else                           zaxisDefLongname(zaxisID, "");
+          //else                           zaxisDefLongname(zaxisID, "");
 	  if ( units && units[0] ) zaxisDefUnits(zaxisID, units);
-          else                     zaxisDefUnits(zaxisID, "");
+          //else                     zaxisDefUnits(zaxisID, "");
 	  zaxisDefDatatype(zaxisID, prec);
 	  zaxisDefLtype(zaxisID, ltype1);
 	}