stronger the error message of tensor's mutable_data (#19303)

* stronger the error message of tensor's mutable_data

test=develop

* update error message

test=develop

paddle/fluid/framework/tensor.cc

@@ -40,7 +40,9 @@ void* Tensor::mutable_data(platform::Place place, proto::VarType::Type type,
   PADDLE_ENFORCE_GE(numel(), 0,
                     "When calling this method, the Tensor's numel must be "
                     "equal or larger than zero. "
-                    "Please check Tensor::Resize has been called first.");
+                    "Please check Tensor::dims, or Tensor::Resize has been "
+                    "called first. The Tensor's shape is [",
+                    dims(), "] now");
   size_t size = numel() * SizeOfType(type);
   if (requested_size) {
     PADDLE_ENFORCE_GE(requested_size, size);
@@ -57,8 +59,8 @@ void* Tensor::mutable_data(platform::Place place, proto::VarType::Type type,
 }
 
 void* Tensor::mutable_data(platform::Place place, size_t requested_size) {
-  PADDLE_ENFORCE(this->holder_ != nullptr,
+  PADDLE_ENFORCE_NOT_NULL(
-                 "Cannot invoke mutable data if current hold nothing.");
+      this->holder_, "Cannot invoke mutable data if current hold nothing.");
   return mutable_data(place, type_, requested_size);
 }