Don't overload types in AMFReader

The typing really doesn't like it if we first let a variable be a list and then
an numpy array

plugins/AMFReader/AMFReader.py

@@ -157,22 +157,22 @@ class AMFReader(MeshReader):
         tri_faces = tri_node.faces
         tri_vertices = tri_node.vertices
 
-        indices = []
-        vertices = []
+        indices_list = []
+        vertices_list = []
 
         index_count = 0
         face_count = 0
         for tri_face in tri_faces:
             face = []
             for tri_index in tri_face:
-                vertices.append(tri_vertices[tri_index])
+                vertices_list.append(tri_vertices[tri_index])
                 face.append(index_count)
                 index_count += 1
-            indices.append(face)
+            indices_list.append(face)
             face_count += 1
 
-        vertices = numpy.asarray(vertices, dtype = numpy.float32)
-        indices = numpy.asarray(indices, dtype = numpy.int32)
+        vertices = numpy.asarray(vertices_list, dtype = numpy.float32)
+        indices = numpy.asarray(indices_list, dtype = numpy.int32)
         normals = calculateNormalsFromIndexedVertices(vertices, indices, face_count)
 
         mesh_data = MeshData(vertices = vertices, indices = indices, normals = normals,file_name = file_name)