Koler V0.2.7 Crashes When A Number Is Pressed While On A Call

Repository: https://github.com/Chooloo/call_manage
Project Name: Koler
Issue Acknowledged & Fixed: https://github.com/Chooloo/call_manage/issues/4

Expected behavior

I expected Koler not to crash when a user types a number while dialing a call.

Actual behavior

It crashes immediately after pressing the first number.

How to reproduce

• dial a number
  ^{( mute, pause, loudspeaker, an option to dial a number, and a + sign button will pop up.)}

• Click on the option to dial a number

• Type a number

• Watch the app crash

• Browser/App version:
  Koler v0.27

• Operating system:
  Android 0

Recording Of The Bug

Here's the Crash Log

    Process: com.chooloo.www.callmanager, PID: 31209
    java.lang.NullPointerException: Attempt to invoke virtual method 'void android.telecom.Call.playDtmfTone(char)' on a null object reference
        at com.chooloo.www.callmanager.util.CallManager.keypad(CallManager.java:108)
        at com.chooloo.www.callmanager.ui.activity.OngoingCallActivity.lambda$onCreate$2(OngoingCallActivity.java:304)
        at com.chooloo.www.callmanager.ui.activity.-$$Lambda$OngoingCallActivity$iL9ptpUuP7OEHn93SAfMj0buAE0.onChanged(Unknown Source:2)
        at androidx.lifecycle.LiveData.considerNotify(LiveData.java:113)
        at androidx.lifecycle.LiveData.dispatchingValue(LiveData.java:131)
        at androidx.lifecycle.LiveData.setValue(LiveData.java:289)
        at androidx.lifecycle.MutableLiveData.setValue(MutableLiveData.java:33)
        at com.chooloo.www.callmanager.viewmodels.SharedDialViewModel.setNumber(SharedDialViewModel.java:32)
        at com.chooloo.www.callmanager.ui.fragment.DialerFragment.setNumber(DialerFragment.java:220)
        at com.chooloo.www.callmanager.ui.fragment.DialerFragment.addChar(DialerFragment.java:120)
        at com.chooloo.www.callmanager.ui.fragment.DialerFragment_ViewBinding$11.doClick(DialerFragment_ViewBinding.java:137)
        at butterknife.internal.DebouncingOnClickListener.onClick(DebouncingOnClickListener.java:18)
        at android.view.View.performClick(View.java:6748)
        at android.view.View$PerformClick.run(View.java:25458)
        at android.os.Handler.handleCallback(Handler.java:790)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:164)
        at android.app.ActivityThread.main(ActivityThread.java:6524)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:888)

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