fix block.get_hitbox again

src/content/ContentBuilder.cpp

@@ -44,6 +44,8 @@ std::unique_ptr<Content> ContentBuilder::build() {
                     def.rt.hitboxes[i].push_back(aabb);
                 }
             }
+        } else {
+            def.rt.hitboxes->emplace_back(AABB(glm::vec3(1.0f)));
         }
 
         blockDefsIndices.push_back(&def);