Fix CI failure

Author: qti-yuduo

onnxruntime/core/providers/qnn/builder/qnn_node_group/scale_softmax_fusion.cc

@@ -29,16 +29,26 @@ constexpr char kOpSoftmax[] = "Softmax";
 /// @param mul Multiply node unit
 /// @return The index of the scalar input (0 or 1) if found, otherwise std::nullopt
 std::optional<size_t> GetMulScalarInputIndex(const NodeUnit* mul) {
-  const NodeArg* mul_x = mul->GetNode().InputDefs()[0];
   const NodeArg* mul_y = mul->GetNode().InputDefs()[1];
-  auto mul_x_shape = utils::GetTensorProtoShape(*mul_x->Shape());
-  auto mul_y_shape = utils::GetTensorProtoShape(*mul_y->Shape());
-  bool is_x_scalar = mul_x_shape.NumDimensions() == 0;
-  bool is_y_scalar = mul_y_shape.NumDimensions() == 0;
-  if (!is_x_scalar && !is_y_scalar) {
-    return std::nullopt;
+  const NodeArg* mul_x = mul->GetNode().InputDefs()[0];
+  auto y_shape_proto = mul_y->Shape();
+  auto x_shape_proto = mul_x->Shape();
+  bool is_y_scalar = false;
+  if (y_shape_proto != nullptr) {
+    auto y_shape = utils::GetTensorProtoShape(*y_shape_proto);
+    is_y_scalar = y_shape.NumDimensions() == 0;
+  }
+  bool is_x_scalar = false;
+  if (x_shape_proto != nullptr) {
+    auto x_shape = utils::GetTensorProtoShape(*x_shape_proto);
+    is_x_scalar = x_shape.NumDimensions() == 0;
+  }
+  if (is_y_scalar) {
+    return 1U;
+  } else if (is_x_scalar) {
+    return 0U;
   }
-  return is_y_scalar ? 1U : 0U;
+  return std::nullopt;
 }
 
 /// @brief Get the axis for softmax