NPE without specified FilterableList

[mstup]

It looks like FilberableList is mandatory to specify before to use component (version 1.0.5)

`public class MainAppActivity extends AppCompatActivity {
private ChipsInput chipsInput;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main_app);

    this.chipsInput = (ChipsInput) findViewById(R.id.chips_input);
    
    // without the next line of code application will crushed with NPE
    chipsInput.setFilterableList(new ArrayList<ChipInterface>());
}

@Override
protected void onResume() {
    super.onResume();

    chipsInput.setFilterableList(new ArrayList<ChipInterface>());
    chipsInput.addChip("Test", null);
    chipsInput.addChipsListener(new ChipsInput.ChipsListener() {
        @Override
        public void onChipAdded(ChipInterface chipInterface, int i) {}

        @Override
        public void onChipRemoved(ChipInterface chipInterface, int i) {}

        @Override
        public void onTextChanged(CharSequence charSequence) {
            String text = charSequence.toString();
            if (text.endsWith(" ")) {
                chipsInput.addChip(text, null);
            }
        }
    });
}

}`

NPE stack trace:

E/AndroidRuntime: FATAL EXCEPTION: main java.lang.NullPointerException at com.pchmn.materialchips.views.ChipsInputEditText.isFilterableListVisible(ChipsInputEditText.java:21) at com.pchmn.materialchips.util.MyWindowCallback.dispatchTouchEvent(MyWindowCallback.java:60) at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1873) at android.view.View.dispatchPointerEvent(View.java:7307) at android.view.ViewRootImpl.deliverPointerEvent(ViewRootImpl.java:3174) at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:3119) at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:4155) at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:4134) at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:4226) at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:171) at android.os.MessageQueue.nativePollOnce(Native Method) at android.os.MessageQueue.next(MessageQueue.java:125) at android.os.Looper.loop(Looper.java:124) at android.app.ActivityThread.main(ActivityThread.java:4745) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:511) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) at dalvik.system.NativeStart.main(Native Method)

[pchmn]

Yeah right, I fixed the bug and pushed the correction in the dev branch, I will soon merge it to the master branch.
Thanks.