Don't try do decode undefined

decodeURIComponent(undefined) is "undefined"

Author: jochenberger

modules/matchPattern.js

@@ -23,7 +23,7 @@ const getMatcher = (pattern, exactly) => {
 
 const parseParams = (pattern, match, keys) =>
   match.slice(1).reduce((params, value, index) => {
-    params[keys[index].name] = decodeURIComponent(value)
+    params[keys[index].name] = value === undefined ? undefined : decodeURIComponent(value)
     return params
   }, {})