NORSPEC-259 nerfed copyContentsToFramebuffer handling of non-FBO sources

indra/llrender/llrendertarget.cpp

@@ -572,8 +572,10 @@ void LLRenderTarget::copyContentsToFramebuffer(LLRenderTarget& source, S32 srcX0
 {
 	if (!source.mFBO)
 	{
-		llerrs << "Cannot copy framebuffer contents for non FBO render targets." << llendl;
+		llwarns << "Cannot copy framebuffer contents for non FBO render targets." << llendl;
+		return;
 	}
+
 	{
 		GLboolean write_depth = mask & GL_DEPTH_BUFFER_BIT ? TRUE : FALSE;