Fix for case where no options are passed or options is not an object, causing the plugin to crash.
Fix for case where no options are passed or options is not an object, causing the plugin to crash.

joshwnj/postcss-modules-local-by-default,douglasduteil/postcss-modules-local-by-default,ojame/postcss-modules-local-by-default,css-modules/postcss-modules-local-by-default