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
It's very common that there's no reasonable fallback to do if the blend or combine string you set isn't supported. So, rather than requiring everybody to pass in a GError purely to catch syntax erorrs, automatically g_warning() if a parse error is encountered and @error is NULL. http://bugzilla.openedhand.com/show_bug.cgi?id=1642 Signed-off-by: Robert Bragg <robert@linux.intel.com>