【stride】fix copy_, set_value when dst is nullptr canot use stridecopy (#74447)

* fix

* fix

* fix

Author: xiaoguoguo626807

paddle/fluid/pybind/eager_method.cc

@@ -1414,7 +1414,7 @@ static PyObject* tensor_method_set_underline_tensor(TensorObject* self,
     if (self->tensor.is_dense_tensor()) {
       auto* dst_tensor =
           static_cast<phi::DenseTensor*>(self->tensor.impl().get());
-      if (self->tensor.has_allocation() &&
+      if (self->tensor.has_allocation() && self->tensor.initialized() &&
               !dst_tensor->meta().is_contiguous() ||
           !src_tensor->meta().is_contiguous()) {
         VLOG(8) << "set_tensor() method , src or dst tensor is not contiguous";

paddle/phi/api/lib/tensor_method.cc

@@ -198,7 +198,8 @@ void Tensor::copy_(const Tensor &src,
     return;
   }
 #endif
-    if(is_dense_tensor() && has_allocation() && src.is_dense_tensor()) {
+    if(is_dense_tensor() && has_allocation() &&
+      initialized() && src.is_dense_tensor()) {
       auto dst_tensor = static_cast<phi::DenseTensor*>(impl_.get());
       auto src_tensor = std::static_pointer_cast<phi::DenseTensor>(src.impl_);
       if(!dst_tensor->meta().is_contiguous() ||