[BUG] Fix empty element handling in boundary plotting logic

Ensure elements with no vertices are properly excluded, raising an error if none remain. This prevents potential runtime issues during 3D plot generation.

Author: Leguark

gempy_viewer/API/_plot_3d_API.py

@@ -125,17 +125,25 @@ def plot_3d(
             **kwargs_plot_topography
         )
 
-    if data_to_show.show_boundaries[0] is True and len(solutions_raw_arrays.vertices) != 0:
+    if data_to_show.show_boundaries[0] is True:
+        # Check elements to plot .vertices are not empty
+        elements_to_plot = model.structural_frame.structural_elements
+        for element in elements_to_plot:
+            if element.vertices is None:
+                elements_to_plot.remove(element)
+        if len(elements_to_plot) == 0:
+            raise ValueError("No elements to plot. Please check the model.")
+        
         if transformed_data:
             surfaces_transform = model.input_transform
             grid_transform = model.grid.transform
         else:
             surfaces_transform = None
             grid_transform = None
-            
+
         plot_surfaces(
             gempy_vista=gempy_vista,
-            structural_elements_with_solution=model.structural_frame.structural_elements,
+            structural_elements_with_solution=elements_to_plot,
             input_transform=surfaces_transform,
             grid_transform=grid_transform,
             **kwargs_plot_surfaces