Quick fix to foundry_install.py to avoid having the script exit on
an error if it tries to build a GDS library from an empty directory.

common/foundry_install.py

diff --git a/common/foundry_install.py b/common/foundry_install.py
index c19098d..e3b5a5b 100755
--- a/common/foundry_install.py
+++ b/common/foundry_install.py
@@ -2310,7 +2310,8 @@
 
                 # Load first file and remove the (UNNAMED) cell
                 if not os.path.isfile(allgdslibname):
-                    print('load ' + os.path.splitext(glist[0])[0], file=ofile)
+                    if len(glist) > 0:
+                        print('load ' + os.path.splitext(glist[0])[0], file=ofile)
                 else:
                     gdslibroot = os.path.split(allgdslibname)[1]
                     print('load ' + os.path.splitext(gdslibroot)[0], file=ofile)