meson: don't pass empty --exclude when building all plugins
''.split(',') returns [''] and not [].
@@ -32,6 +32,7 @@ cargo_cmd = ['cargo', 'build', '--manifest-path',
if target == 'release':
cargo_cmd.append('--release')
+if len(exclude) > 0:
for e in exclude.split(','):
cargo_cmd.append('--exclude')
cargo_cmd.append(e)
