Merge branch 'make-options-optional'

Author: mxmul

lib/index.js

@@ -217,7 +217,9 @@ module.exports = function loader(originalSource, inputSourceMap) {
     const config = merge(
         {},
         defaultConfig,
-        this.options ? this.options[options.config || 'closureLoader'] : {},
+        this.options
+            ? this.options[(options && options.config) || 'closureLoader']
+            : {},
         options,
     );