Skip particle-glow vbo logic if shaders aren't enabled.

indra/newview/llvopartgroup.cpp

@@ -717,7 +717,7 @@ void LLVOPartGroup::getGeometry(S32 idx,
 	*colorsp++ = color;
 
 	//Only add emissive attributes if glowing (doing it for all particles is INCREDIBLY inefficient as it leads to a second, slower, render pass.)
-	if (pglow.mV[3] > F_ALMOST_ZERO || part.mGlow.mV[3] > F_ALMOST_ZERO)
+	if (gPipeline.canUseVertexShaders() && (pglow.mV[3] > 0 || part.mGlow.mV[3] > 0))
 	{ //only write glow if it is not zero
 		*emissivep++ = pglow;
 		*emissivep++ = pglow;