To fix the system detection

Custom_Hooks/eb_hooks.py

@@ -68,6 +68,8 @@ def installation_vetoer(ec):
     "Check whether this package is NOT supposed to be installed in this system, and abort if necessary"
     name = ec['name']
     system_name = os.getenv('LMOD_SYSTEM_NAME')
+    if system_name is None:
+        with open('/etc/FZJ/systemname') as sn: system_name = sn.read()
     if name in VETOED_INSTALLATIONS[system_name]:
         print_warning(
                 "\nYou are attempting to install software that should not be installed in this system.\n"