fixed test netcdf

testbmirunnetcdf and testapirun_netcfd did fail (OSError: [Errno -51] NetCDF: Unknown file format: staticoutmaps.nc)

wflow/wf_netcdfio.py

@@ -452,6 +452,8 @@ def date_range(start, end, timestepsecs):
         self.buffdirty = False
 
         globmetadata.update(metadata)
+
+        self.nc_trg = None
 
         prepare_nc(
             self.ncfile,
@@ -479,10 +481,11 @@ def savetimestep(self, timestep, pcrdata, unit="mm", var="P", name="Precipitatio
         """
         # Open target netCDF file
         var = os.path.basename(var)
-        self.nc_trg = netCDF4.Dataset(
-            self.ncfile, "a", format=self.Format, zlib=self.zlib, complevel=9
-        )
-        self.nc_trg.set_fill_off()
+        if not self.nc_trg:
+            self.nc_trg = netCDF4.Dataset(
+                self.ncfile, "a", format=self.Format, zlib=self.zlib, complevel=9
+            )
+            self.nc_trg.set_fill_off()
         # read time axis and convert to time objects
         # TODO: use this to append time
         # time = self.nc_trg.variables['time']