fix: rm BINARY_TAG; allow empty LD_LIBRARY_PATH

containers/jug/profile.d/z11_jug_env.sh

@@ -3,11 +3,10 @@
 # FIXME: add ROOT libraries to LD_LIBRARY_PATH until removal can be tested 
 export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib/root
 
-export BINARY_TAG=x86_64-linux-gcc9-opt
 if [ ! -z ${EIC_SHELL_PREFIX} ]; then
   if [  "$LD_LIBRARY_PATH" != *"${EIC_SHELL_PREFIX}/lib"* ]; then
-    export LD_LIBRARY_PATH=$EIC_SHELL_PREFIX/lib:$LD_LIBRARY_PATH
-    export PATH=$EIC_SHELL_PREFIX/bin:$PATH
+    export LD_LIBRARY_PATH=$EIC_SHELL_PREFIX/lib${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}
+    export PATH=$EIC_SHELL_PREFIX/bin${PATH:+:$PATH}
   fi
 fi