[PATCH 2/8] gettext: don't poison if GIT_GETTEXT_POISON is set but empty

["SZEDER Gábor" <szeder.dev@gmail.com>]

This allows us to run test with non-GETTEXT POISON-ed behavior even in
a GETTEXT POISON build by running:

  GIT_GETTEXT_POISON= ./t1234-foo.sh

Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com>
---
 Makefile  | 2 +-
 gettext.c | 9 +++++++--
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/Makefile b/Makefile
index ad880d1fc5..7a165445cd 100644
--- a/Makefile
+++ b/Makefile
@@ -365,7 +365,7 @@ all::
 # Define GETTEXT_POISON if you are debugging the choice of strings marked
 # for translation.  In a GETTEXT_POISON build, you can turn all strings marked
 # for translation into gibberish by setting the GIT_GETTEXT_POISON variable
-# (to any value) in your environment.
+# to a non-empty value in your environment.
 #
 # Define JSMIN to point to JavaScript minifier that functions as
 # a filter to have gitweb.js minified.
diff --git a/gettext.c b/gettext.c
index 7272771c8e..a9509a5df3 100644
--- a/gettext.c
+++ b/gettext.c
@@ -50,8 +50,13 @@ const char *get_preferred_languages(void)
 int use_gettext_poison(void)
 {
 	static int poison_requested = -1;
-	if (poison_requested == -1)
-		poison_requested = getenv("GIT_GETTEXT_POISON") ? 1 : 0;
+	if (poison_requested == -1) {
+		const char *v = getenv("GIT_GETTEXT_POISON");
+		if (v && *v)
+			poison_requested = 1;
+		else
+			poison_requested = 0;
+	}
 	return poison_requested;
 }
 #endif
-- 
2.19.1.681.g6bd79da3f5