works also for arrays ...

python/damask/_table.py

@@ -46,7 +46,7 @@ class Table:
 
 
     def _add_comment(self,label,shape,info):
-        if info:
+        if info is not None:
             c = '{}{}: {}'.format(label,' '+str(shape) if np.prod(shape,dtype=int) > 1 else '',info)
             self.comments.append(c)
 
@@ -251,7 +251,7 @@ class Table:
 
         """
         self.data.rename(columns={label_old:label_new},inplace=True)
-        c = '{} => {}{}'.format(label_old,label_new,'' if not info else ': {}'.format(info))
+        c = '{} => {}{}'.format(label_old,label_new,'' if info is None else ': {}'.format(info))
         self.comments.append(c)
         self.shapes = {(label if label != label_old else label_new):self.shapes[label] for label in self.shapes}
 

python/damask/_vtk.py

@@ -131,7 +131,7 @@ class VTK:
             reader = vtk.vtkGenericDataObjectReader()
             reader.SetFileName(fname)
             reader.Update()
-            if not dataset_type:
+            if dataset_type is None:
                 raise TypeError('Dataset type for *.vtk file not given.')
             elif dataset_type.lower().endswith('rectilineargrid'):
                 geom = reader.GetRectilinearGridOutput()
@@ -196,7 +196,7 @@ class VTK:
 
         if   isinstance(data,np.ndarray):
             d = np_to_vtk(num_array=data.reshape(data.shape[0],-1),deep=True)
-            if not label:
+            if label is None:
                 raise ValueError('No label defined for numpy.ndarray')
             d.SetName(label)
             if   data.shape[0] == N_cells: