Validator crash

[jingtang10]

Describe the bug
2021-07-01 17:28:00.519 5632-5632/com.example.sdctest E/MessageQueue-JNI: java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
at java.util.ArrayList.get(ArrayList.java:437)
at com.google.android.fhir.datacapture.validation.PrimitiveTypeAnswerMaxLengthValidator.validate(PrimitiveTypeAnswerMaxLengthValidator.kt:38)
at com.google.android.fhir.datacapture.validation.QuestionnaireResponseItemValidator.validate(QuestionnaireResponseItemValidator.kt:43)
at com.google.android.fhir.datacapture.views.QuestionnaireItemEditTextViewHolderDelegate$init$2.onFocusChange(QuestionnaireItemEditTextViewHolderFactory.kt:59)
at android.view.View.onFocusChanged(View.java:7265)
at android.widget.TextView.onFocusChanged(TextView.java:10005)
at android.view.View.clearFocusInternal(View.java:7101)
at android.view.View.unFocus(View.java:7134)
at android.view.ViewGroup.unFocus(ViewGroup.java:1155)
at android.view.ViewGroup.unFocus(ViewGroup.java:1155)
at android.view.ViewGroup.unFocus(ViewGroup.java:1155)
at android.view.ViewGroup.requestChildFocus(ViewGroup.java:813)
at androidx.recyclerview.widget.RecyclerView.requestChildFocus(RecyclerView.java:2896)
at android.view.ViewGroup.requestChildFocus(ViewGroup.java:819)
at android.view.ViewGroup.requestChildFocus(ViewGroup.java:819)
at android.view.ViewGroup.requestChildFocus(ViewGroup.java:819)
at android.view.View.handleFocusGainInternal(View.java:6926)
at android.view.View.requestFocusNoSearch(View.java:11546)
at android.view.View.requestFocus(View.java:11520)
at android.view.View.requestFocus(View.java:11487)
at android.view.View.requestFocus(View.java:11429)
at com.google.android.material.textfield.DropdownMenuEndIconDelegate.showHideDropdown(DropdownMenuEndIconDelegate.java:288)
at com.google.android.material.textfield.DropdownMenuEndIconDelegate.access$500(DropdownMenuEndIconDelegate.java:67)
at com.google.android.material.textfield.DropdownMenuEndIconDelegate$7.onTouch(DropdownMenuEndIconDelegate.java:402)
at android.view.View.dispatchTouchEvent(View.java:12509)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3030)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2719)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3030)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2719)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3030)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2719)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3030)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2719)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3030)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2719)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3030)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2719)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3030)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2719)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3030)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2719)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3030)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2719)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3030)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2719)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3030)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2719)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3030)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2719)
at com.android.internal.policy.DecorView.superDispatchTouchEvent(DecorView.java:440)
at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1830)
at android.app.Activity.dispatchTouchEvent(Activity.java:3400)
at androidx.appcompat.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.

Component
SDC library

To Reproduce
Steps to reproduce the behavior:

1. Open any questionnaire, go to a text input box and move away

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
NA

Smartphone (please complete the following information):

• Device: Pixel 2 emulator

Additional context
NA

Would you like to work on the issue?
Yes