do not use an empty APT_CONFIG environment variable

diff --git a/apt-pkg/init.cc b/apt-pkg/init.cc
index 81b601a7fa7ff45222743e4c04e14e515b4bee8b..6ab5ec42d0fb15594252ecc927bff2880aa800de 100644 (file)
--- a/apt-pkg/init.cc
+++ b/apt-pkg/init.cc
@@ -92,7 +92,7 @@ bool pkgInitConfig(Configuration &Cnf)
    
    // Read an alternate config file
    const char *Cfg = getenv("APT_CONFIG");
-   if (Cfg != 0)
+   if (Cfg != 0 && strlen(Cfg) != 0)
    {
       if (RealFileExists(Cfg) == true)
         Res &= ReadConfigFile(Cnf,Cfg);