Take care of the case when there are no stations to be stored in the graph file.

GraphHydro.py

@@ -176,7 +176,6 @@ class HydroGraph :
             outnf.createDimension('bnd', nbcorners)
             outnf.createDimension('inflow', self.max_inflow)
             outnf.createDimension('stnperhtu', nlmax)
-            outnf.createDimension('locations', nblocated)
         else :
             outnf = None
         #

Locations.py

@@ -212,20 +212,21 @@ class Locations :
         if part.rank == 0:
             # Create new dimension
             monmax = np.max(monnb)
-            moncoord = ('htumon',)
-            outnf.createDimension(moncoord[0], monmax)
-            infocoord = ('locinfo',)
-            outnf.createDimension(infocoord[0], 5)
-            # Create variable for the list of stations
-            locvar = outnf.createVariable(locname, vtyp,  infocoord+loccoord)
-            locvar.title = loctitle
-            locvar.units = locunits
-            locvar.description = "ID, i-index, j-index, HTU-index, monitoring-index"
-            locvar[:,:] = locationlist
-            # Create variable for the indices of the HTU to monitor
-            monvar = outnf.createVariable(monname, vtyp, moncoord+spacecoord)
-            monvar.title = montitle
-            monvar.units= monunits
-            monvar[:,:,:] = htumon[0:monmax,:,:]
+            if monmax > 0 :
+                moncoord = ('htumon',)
+                outnf.createDimension(moncoord[0], monmax)
+                infocoord = ('locinfo',)
+                outnf.createDimension(infocoord[0], 5)
+                # Create variable for the list of stations
+                locvar = outnf.createVariable(locname, vtyp,  infocoord+loccoord)
+                locvar.title = loctitle
+                locvar.units = locunits
+                locvar.description = "ID, i-index, j-index, HTU-index, monitoring-index"
+                locvar[:,:] = locationlist
+                # Create variable for the indices of the HTU to monitor
+                monvar = outnf.createVariable(monname, vtyp, moncoord+spacecoord)
+                monvar.title = montitle
+                monvar.units= monunits
+                monvar[:,:,:] = htumon[0:monmax,:,:]
         return
 #