Fix #147710: Crash binding Surface Deform modifier to faceless mesh

- Add an explicit check with a better error message than "Out of memory"
- Initialize SDefVert so the later null checks don't try to free
  uninitialized data.

Pull Request: https://projects.blender.org/blender/blender/pulls/147723

source/blender/modifiers/intern/MOD_surfacedeform.cc

@@ -1183,6 +1183,11 @@ static bool surfacedeformBind(Object *ob,
   uint tedges_num = target->edges_num;
   int adj_result;
 
+  if (target->faces_num == 0) {
+    BKE_modifier_set_error(ob, (ModifierData *)smd_eval, "Target has no faces");
+    return false;
+  }
+
   SDefAdjacencyArray *vert_edges = MEM_calloc_arrayN<SDefAdjacencyArray>(target_verts_num,
                                                                          "SDefVertEdgeMap");
   if (vert_edges == nullptr) {
@@ -1206,7 +1211,7 @@ static bool surfacedeformBind(Object *ob,
     return false;
   }
 
-  smd_orig->verts = MEM_malloc_arrayN<SDefVert>(size_t(verts_num), "SDefBindVerts");
+  smd_orig->verts = MEM_calloc_arrayN<SDefVert>(size_t(verts_num), "SDefBindVerts");
   if (smd_orig->verts == nullptr) {
     BKE_modifier_set_error(ob, (ModifierData *)smd_eval, "Out of memory");
     freeAdjacencyMap(vert_edges, adj_array, edge_polys);