code: public String get( final String propertyName )
      {
          String value = findProperty( propertyName );
          if( value == null && m_fallbackResolver != null )
          {
              value = m_fallbackResolver.get( propertyName );
          }
          return value;
      }
docs: Resolves a property based on its name by first calling the findProperty() and then fallback to falback resolver
  if property value is null.
  
  @param propertyName property name to be resolved
  
  @return value of property or null if property is not set or is empty.