fix(router): ignore null or undefined query parameters (#12333)

modules/@angular/router/src/router.ts

@@ -524,6 +524,9 @@ export class Router {
    */
   navigate(commands: any[], extras: NavigationExtras = {skipLocationChange: false}):
       Promise<boolean> {
+    if (typeof extras.queryParams === 'object' && extras.queryParams !== null) {
+      extras.queryParams = this.removeEmptyProps(extras.queryParams);
+    }
     return this.navigateByUrl(this.createUrlTree(commands, extras), extras);
   }
 
@@ -549,6 +552,16 @@ export class Router {
     }
   }
 
+  private removeEmptyProps(params: Params): Params {
+    return Object.keys(params).reduce((result: Params, key: string) => {
+      const value: any = params[key];
+      if (value !== null && value !== undefined) {
+        result[key] = value;
+      }
+      return result;
+    }, {});
+  }
+
   private processNavigations(): void {
     concatMap
         .call(