From 1f2c23bee4844d3fc38b4efa2c82fe751852782c Mon Sep 17 00:00:00 2001
From: Murray Stevenson <50844517+murraystevenson@users.noreply.github.com>
Date: Thu, 27 Feb 2025 17:45:06 -0800
Subject: [PATCH] SConstruct : Sanitise commandEnv environment variables

Otherwise the `RENDERMAN_ROOT` "" default turns into `RMANTREE = ""`, which leads to errors in the documentation build as we try to import GafferRenderMan.
---
 SConstruct | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/SConstruct b/SConstruct
index 44765627a9..f7505e3276 100644
--- a/SConstruct
+++ b/SConstruct
@@ -788,7 +788,8 @@ for option, envVar in {
 	"ONNX_ROOT" : "ONNX_ROOT",
 	"RENDERMAN_ROOT" : "RMANTREE",
 }.items() :
-	commandEnv["ENV"][envVar] = commandEnv[option]
+	if commandEnv[option] != "" :
+		commandEnv["ENV"][envVar] = commandEnv[option]
 
 def runCommand( command ) :