From f6741516a43a605ed7f8f3d1d96517e7e46ef54d Mon Sep 17 00:00:00 2001
From: Chris Thielen <github@sandgnat.com>
Date: Wed, 31 Aug 2016 01:42:56 -0500
Subject: [PATCH] fix(ng1.stateService): Coerce 'null' `params` value to empty
 object Closes #2952

---
 src/state/stateService.ts | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/state/stateService.ts b/src/state/stateService.ts
index 7eed7d5e7..811f1be92 100644
--- a/src/state/stateService.ts
+++ b/src/state/stateService.ts
@@ -460,7 +460,7 @@ export class StateService {
    *
    * @returns {string} compiled state url
    */
-  href(stateOrName: StateOrName, params?: RawParams, options?: HrefOptions): string {
+  href(stateOrName: StateOrName, params: RawParams, options?: HrefOptions): string {
     let defaultHrefOpts = {
       lossy:    true,
       inherit:  true,
@@ -468,11 +468,12 @@ export class StateService {
       relative: this.$current
     };
     options = defaults(options, defaultHrefOpts);
+    params = params || {};
 
     let state = this.router.stateRegistry.matcher.find(stateOrName, options.relative);
 
     if (!isDefined(state)) return null;
-    if (options.inherit) params = <any> this.params.$inherit(params || {}, this.$current, state);
+    if (options.inherit) params = <any> this.params.$inherit(params, this.$current, state);
 
     let nav = (state && options.lossy) ? state.navigable : state;