From c16453f955e13c3d87570ecaa8fc249af9ab623f Mon Sep 17 00:00:00 2001
From: Adam Sampson <ats@offog.org>
Date: Sat, 28 May 2022 17:02:52 +0100
Subject: [PATCH] Don't append NULL when a variable doesn't exist

This caused a glib warning when the following was encountered in
xml2po.pc (and PYTHON_PREFIX wasn't defined):
modesdir=${PYTHON_PREFIX}/lib/python2.7/site-packages/xml2po
---
 parse.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/parse.c b/parse.c
index 6e9907c..dcfd088 100644
--- a/parse.c
+++ b/parse.c
@@ -206,7 +206,8 @@ trim_and_sub (Package *pkg, const char *str, const char *path)
 
           g_free (varname);
 
-          g_string_append (subst, varval);
+          if (varval)
+            g_string_append (subst, varval);
           g_free (varval);
         }
       else
-- 
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