[GHPython] Added clear_edges and clear_nodes to NetworkArtist

Author: arpastrana

src/compas_ghpython/artists/networkartist.py

@@ -95,3 +95,13 @@ def draw_edges(self, edges=None, color=None):
                 'name': "{}.edge.{}-{}".format(self.network.name, u, v)
             })
         return compas_ghpython.draw_lines(lines)
+
+    def clear_edges(self):
+        """GH Artists are state-less. Therefore, clear does not have any effect.
+        """
+        pass
+
+    def clear_nodes(self):
+        """GH Artists are state-less. Therefore, clear does not have any effect.
+        """
+        pass