binarycreator should not generate online installer if no remote repository is configured

How to reproduce

• Go to examples/tutorial, call '..\..\bin\binarycreator --ignore-translations -t ..\..\bin\installerbase.exe -c config\config.xml -p packages tutorial.exe'
• Run tutorial.exe

What happens

• Installer complains with "At least one valid and enabled repository required for this action to succeed"

What I expect to happen

• The installer should check that config.xml does not contain '<RemoteRepositories>', and assume the installer is offline only