Fix: Curve Resample Node: Copy attributes to 1 point results

The curve resample node neglected to copy attributes to single point
result splines. That could have caused errors if some of the splines
in the result had only one point but others had more.

source/blender/nodes/geometry/nodes/node_geo_curve_resample.cc

@@ -87,6 +87,23 @@ static SplinePtr resample_spline(const Spline &input_spline, const int count)
                              input_spline.tilts().first(),
                              input_spline.radii().first());
     output_spline->attributes.reallocate(1);
+    input_spline.attributes.foreach_attribute(
+        [&](StringRefNull name, const AttributeMetaData &meta_data) {
+          std::optional<GSpan> src = input_spline.attributes.get_for_read(name);
+          BLI_assert(src);
+          if (!output_spline->attributes.create(name, meta_data.data_type)) {
+            BLI_assert_unreachable();
+            return false;
+          }
+          std::optional<GMutableSpan> dst = output_spline->attributes.get_for_write(name);
+          if (!dst) {
+            BLI_assert_unreachable();
+            return false;
+          }
+          src->type().copy_assign(src->data(), dst->data());
+          return true;
+        },
+        ATTR_DOMAIN_POINT);
     return output_spline;
   }