fix(doctest): fix doctests for plots

Author: PProfizi

src/ansys/dpf/core/field.py

@@ -543,6 +543,7 @@ def plot(
         >>> fields_container = disp.outputs.fields_container()
         >>> field = fields_container[0]
         >>> mesh.plot(field)
+        (None, <pyvista.plotting.plotter.Plotter ...>)
 
         Parameters
         ----------

src/ansys/dpf/core/meshed_region.py

@@ -586,6 +586,7 @@ def plot(
         >>> disp = model.results.displacement()
         >>> field = disp.outputs.fields_container()[0]
         >>> model.metadata.meshed_region.plot(field)
+        (None, <pyvista.plotting.plotter.Plotter ...>)
 
         """
         if field_or_fields_container is not None:

src/ansys/dpf/core/meshes_container.py

@@ -93,6 +93,7 @@ def plot(self, fields_container=None, deform_by=None, scale_factor=1.0, **kwargs
         ... )
         >>> disp_fc = disp_op.outputs.fields_container()
         >>> meshes_cont.plot(disp_fc)
+        (None, <pyvista.plotting.plotter.Plotter ...>)
 
         """
         # DPF defaults

src/ansys/dpf/core/model.py

@@ -254,6 +254,7 @@ def plot(self, color="w", show_edges=True, **kwargs):
         >>> transient = examples.download_transient_result()
         >>> model = Model(transient)
         >>> model.plot()
+        (None, <pyvista.plotting.plotter.Plotter ...>)
 
         """
         from ansys.dpf.core.plotter import DpfPlotter