slim3d: bug fix for exports in netcdf

dgpy/scripts/slim3d.py

@@ -334,9 +334,9 @@ class Loop:
             timeIntegrator.exporter_computeW()
         if self._export_rho:
             timeIntegrator.exporter_computeRho()
-        if self._export_eta:
+        if (self._export_eta or self._export_eta_nc):
             timeIntegrator.exporter_computeEta()
-        if self._export_z:
+        if (self._export_z or self._export_z_nc):
             timeIntegrator.exporter_computeZ()
         for e in self._export :
             e.exportIdx(timeIntegrator.getExportCount(), timeIntegrator.getTime() - self.initial_time)