Crash when pressing emoji button
``` java.lang.StringIndexOutOfBoundsException: length=0; index=0 at java.lang.String.charAt(Native Method) at java.lang.Character.codePointAt(Character.java:4709) at org.thoughtcrime.securesms.components.emoji.EmojiView.setEmoji(EmojiV iew.java:45) at org.thoughtcrime.securesms.components.emoji.EmojiPageView$EmojiGridAd apter.getView(EmojiPageView.java:108) at android.widget.AbsListView.obtainView(AbsListView.java:3229) at android.widget.GridView.makeAndAddView(GridView.java:1618) at android.widget.GridView.makeRow(GridView.java:392) at android.widget.GridView.fillDown(GridView.java:333) at android.widget.GridView.fillFromTop(GridView.java:468) at android.widget.GridView.layoutChildren(GridView.java:1447) at android.widget.AbsListView.onLayout(AbsListView.java:2999) at android.view.View.layout(View.java:18799) at android.view.ViewGroup.layout(ViewGroup.java:5952) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323) at android.widget.FrameLayout.onLayout(FrameLayout.java:261) at android.view.View.layout(View.java:18799) at android.view.ViewGroup.layout(ViewGroup.java:5952) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323) at android.widget.FrameLayout.onLayout(FrameLayout.java:261) at android.view.View.layout(View.java:18799) at android.view.ViewGroup.layout(ViewGroup.java:5952) at android.support.v4.view.ViewPager.onLayout(ViewPager.java:1695) at android.view.View.layout(View.java:18799) at android.view.ViewGroup.layout(ViewGroup.java:5952) at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1741) at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585) at android.widget.LinearLayout.onLayout(LinearLayout.java:1494) at android.view.View.layout(View.java:18799) at android.view.ViewGroup.layout(ViewGroup.java:5952) at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1741) at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585) at android.widget.LinearLayout.onLayout(LinearLayout.java:1494) at android.view.View.layout(View.java:18799) at android.view.ViewGroup.layout(ViewGroup.java:5952) at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1741) at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585) at android.widget.LinearLayout.onLayout(LinearLayout.java:1494) at android.view.View.layout(View.java:18799) at android.view.ViewGroup.layout(ViewGroup.java:5952) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323) at android.widget.FrameLayout.onLayout(FrameLayout.java:261) at android.view.View.layout(View.java:18799) at android.view.ViewGroup.layout(ViewGroup.java:5952) at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1741) at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585) at android.widget.LinearLayout.onLayout(LinearLayout.java:1494) at android.view.View.layout(View.java:18799) at android.view.ViewGroup.layout(ViewGroup.java:5952) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323) at android.widget.FrameLayout.onLayout(FrameLayout.java:261) at android.view.View.layout(View.java:18799) at android.view.ViewGroup.layout(ViewGroup.java:5952) at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1741) at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585) at android.widget.LinearLayout.onLayout(LinearLayout.java:1494) at android.view.View.layout(View.java:18799) at android.view.ViewGroup.layout(ViewGroup.java:5952) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323) at android.widget.FrameLayout.onLayout(FrameLayout.java:261) at com.android.internal.policy.DecorView.onLayout(DecorView.java:822) at android.view.View.layout(View.java:18799) at android.view.ViewGroup.layout(ViewGroup.java:5952) at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2634) at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2350) at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1509) at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7051) at android.view.Choreographer$CallbackRecord.run(Choreographer.java:927) at android.view.Choreographer.doCallbacks(Choreographer.java:702) at android.view.Choreographer.doFrame(Choreographer.java:638) at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:913) at android.os.Handler.handleCallback(Handler.java:751) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6692) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1468) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1358) ``` * Android version: 7.0 * Phone model: SM-G930F (heroltexx) * Briar version: 0.16.3 (531e555) * User feedback: "Always I use the Emojibutton the App crashes" ``` 07-27 09:51:31.917 I/EmojiProvider(22804): Loading page emoji_symbols.png 07-27 09:51:31.953 I/EmojiProvider(22804): Loaded page emoji_symbols.png 07-27 09:51:31.953 I/EmojiProvider(22804): Loading page emoji_objects.png 07-27 09:51:31.987 I/EmojiProvider(22804): Loaded page emoji_objects.png 07-27 09:51:32.407 I/BriarRecyclerView(22804): Removing Handler Callback 07-27 09:51:36.910 I/EmojiDrawer(22804): Showing emoji drawer with height 846 07-27 09:51:36.937 E/ACRA (22804): ACRA caught a StringIndexOutOfBoundsException for org.briarproject.briar.beta ```
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