SL-20611 Followup -- fix for impostors being invisible.

indra/newview/pipeline.cpp

@@ -8235,6 +8235,11 @@ void LLPipeline::doAtmospherics()
 {
     LL_PROFILE_ZONE_SCOPED_CATEGORY_PIPELINE;
 
+    if (sImpostorRender)
+    { // do not attempt atmospherics on impostors
+        return;
+    }
+
     if (RenderDeferredAtmospheric)
     {
         {
@@ -8294,6 +8299,10 @@ void LLPipeline::doAtmospherics()
 void LLPipeline::doWaterHaze()
 {
     LL_PROFILE_ZONE_SCOPED_CATEGORY_PIPELINE;
+    if (sImpostorRender)
+    { // do not attempt water haze on impostors
+        return;
+    }
 
     if (RenderDeferredAtmospheric)
     {