return key value when key value is undefined

return `fromObject[key]` if undefined since there is no point going any further

Author: TimOgilvy

src/get-key-value.js

@@ -78,7 +78,7 @@ function _getValue(fromObject, key, keys) {
 
   if (keys.length === 0) {
     if (isValueArray) {
-      if (typeof arrayIndex === 'undefined') {
+      if (typeof arrayIndex === 'undefined' || fromObject[key] === undefined) {
         result = fromObject[key];
       } else {
         result = fromObject[key][arrayIndex];
@@ -141,4 +141,4 @@ function _getValue(fromObject, key, keys) {
   }
 
   return result;
-}
+}