osg::Program::isFixedFunction() should'nt return true if fixed function unavailable #330
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…is unavailable, even if _shaderList.empty() is true
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I ran into an issue where osg::Program::isFixedFunction() was called with openGL CoreProfile used and without fixed function available. I believe that this method shouldn't return true if fixed function is unavailable, even if _shaderList.empty() is true.