Show warning if the user hasn't specified a home address

Closes #140

What does this MR do?

(briefly describe what this MR is about)

Links to related issues

Checklist

• no unrelated changes
• joined #fs-dev-android-beta channel at https://slackin.yunity.org
• added an entry to CHANGELOG.md
• increased the versionCode in /app/build.gradle

Closes #140