Show Solution doesn't work if Sound effects is disabled

Description

Issue was reported in https://h5p.org/node/113857

Steps to recreate the issue:
1. Create a Single Choice set (Stand alone or embeded in Column, Question Set and Course Presentation)
2. Uncheck "Enable Sound Effects"
3. Answer some questions wrong
4. Click on Show Solution button - Nothing happens.

Below are 2 test contents:
Embeded in CP
Stand Alone

Environment

Contents created in H5P.org

Tested in:
OS: macOS Sierra (V10.12.3)

Browsers:
Firefox Version 54.0.1 (64-bit)
Chrome Version 60.0.3112.101 (Official Build) (64-bit)
Safari Version 10.0.3 (12602.4.8)

Acceptance Criteria

Disabling the sound effects should not affect the show solution option.

Status

Assignee

Pål Jørgensen

Reporter

Bienvenido Villadelrey

Labels

None

Funding

None

Code reviewer

Thomas Marstrander

Released

Released

Time tracking

0m

Fix versions

Sprint

None

Priority

Highest