Allow configure.py parse_multiple_enable to accept an empty list and extra commas.

Examples:
  ./configure.py --enable-modules=
  ./configure.py --enable-modules=zlib,openssl,
  ./configure.py --enable-modules=zlib,,bzip2,

1 files changed, 2 insertions, 1 deletions

diff --git a/configure.py b/configure.py
index 31c6beeab..c5a3fda32 100755
--- a/configure.py
+++ b/configure.py
@@ -619,7 +619,8 @@ def process_command_line(args): # pylint: disable=too-many-locals,too-many-state
     def parse_multiple_enable(modules):
         if modules is None:
             return []
-        return sorted(set(flatten([s.split(',') for s in modules])))
+
+        return sorted({m for m in flatten([s.split(',') for s in modules]) if m != ''})
 
     options.enabled_modules = parse_multiple_enable(options.enabled_modules)
     options.disabled_modules = parse_multiple_enable(options.disabled_modules)