Impossible to get value of single-value metadata

[savuor]

The following code produces exception:

std::shared_ptr<vmf::MetadataDesc> desc(new vmf::MetadataDesc(name, type));
std::shared_ptr<vmf::Metadata> metadata(new vmf::Metadata(desc));
metadata->addValue(value);
metadata->getFieldValue("");

where name, type and value are respectively any allowed:

• name of metadata description
• Variant type
• field value

The reason is that creating single-value descriptions is possible, but accessing the (only) field of metadata based on them is impossible. The exception is thrown at the following string:

vmf::Variant Metadata::getFieldValue( const std::string& sName ) const
{
    if( sName.empty() )
    {
        VMF_EXCEPTION(IncorrectParamException, "Field name not specified!");
...

[savuor]

Fix added: #31