Values should be able to hold empty vector

Summary

Currently, creating a value with an empty vector does not make this a vector.

Expected Behavior

It should be a vector.

Actual Behavior

Steps to Reproduce the Problem

Look at the unit test in brach f-empty-vector:

  auto empty_content = std::vector<int>();
  Value value_0(empty_content);
  EXPECT_TRUE(value_0.IsVector());
  auto list_value_0 = value_0.GetAsVector();
  EXPECT_EQ(list_value_0.size(), 0);
  EXPECT_TRUE(list_value_0.empty());

Specifications

• Version: Current dev.
• Platform: Which operating system, which other relevant software versions?

Possible fixes

Branch f-empty-vector