Fixed SharedFragmentHelper#render_theme_header_to_string: made it return a nil if file wasn't found for backwards compatibility.
Fixed SharedFragmentHelper#render_theme_header_to_string: made it return a nil if file wasn't found for backwards compatibility.

ondrocks/openconferenceware,mynameisfashanu/openconferenceware,osbridge/openconferenceware,ondrocks/openconferenceware,osbridge/openconferenceware,mynameisfashanu/openconferenceware,mynameisfashanu/openconferenceware,mynameisfashanu/openconferenceware,osbridge/openconferenceware,ondrocks/openconferenceware,osbridge/openconferenceware,ondrocks/openconferenceware