return "" instead of NULL for <RRD::GETENV UNKNOWN_VARIABLE> -- Michael <sysadmin...

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk@55 a5681a0c-68f1-0310-ab6d-d61299d08faa

diff --git a/program/src/rrd_cgi.c b/program/src/rrd_cgi.c
index e79ecb7c1bee78fa1d6ad49a52cbe4b1167cac3e..14ce2d48cb2671d3421e16c10368e4052fa30383 100644 (file)
--- a/program/src/rrd_cgi.c
+++ b/program/src/rrd_cgi.c
@@ -211,8 +211,13 @@ char* rrdsetenv(long argc, char **args){
 char* rrdgetenv(long argc, char **args){
   if (argc != 1) {
     return stralloc("[ERROR: getenv faild because it did not get 1 argument only]");
-  };
-  return stralloc(getenv(args[0]));
+  }
+  else if (getenv(args[0]) == NULL) {
+    return stralloc("");
+  }
+  else {
+    return stralloc(getenv(args[0]));
+  }
 }
 
 char* rrdgoodfor(long argc, char **args){