AST-1637 Support model data in BdaBuffer

base/BdaBuffer.cc

@@ -58,8 +58,7 @@ BdaBuffer::BdaBuffer(const BdaBuffer& other, const Fields& fields)
   // The assertions below check that aocommon::UVector still has this behavior.
   if (fields.data) {
     data_ = other.data_;  // Copy all data buffers.
-    // Add main data buffer if absent.
-    data_[""];
+    data_[""];            // Add main data buffer if absent.
     // Resize all data buffers.
     for (auto it = data_.begin(); it != data_.end(); ++it) {
       it->second.resize(original_capacity_);