Exception thrown when onWeekSelected is null

[pb-iatros]

version 1.0.7

actual behaviour
When user navigates to another week (button or swipe) and function onWeekSelected is null, an exception is thrown

expected behaviour
calendar is rendered on the correct week. Define onWeekSelected as mandatory, or perform null check

workaround until fix is available
add onWeekSelected: (_) => { }, on constructor

I/flutter ( 8219): ══╡ EXCEPTION CAUGHT BY GESTURE ╞═══════════════════════════════════════════════════════════════════
I/flutter ( 8219): The following NoSuchMethodError was thrown while handling a gesture:
I/flutter ( 8219): The method 'call' was called on null.
I/flutter ( 8219): Receiver: null
I/flutter ( 8219): Tried calling: call(Instance of 'DateTime')
I/flutter ( 8219): 
I/flutter ( 8219): When the exception was thrown, this was the stack:
I/flutter ( 8219): #0      Object.noSuchMethod (dart:core-patch/object_patch.dart:51:5)
I/flutter ( 8219): #1      CalendarStripState.onNextRow.<anonymous closure> (package:calendar_strip/calendar_strip.dart:243:28)
I/flutter ( 8219): #2      State.setState (package:flutter/src/widgets/framework.dart:1244:30)
I/flutter ( 8219): #3      CalendarStripState.onNextRow (package:calendar_strip/calendar_strip.dart:241:5)
I/flutter ( 8219): #4      _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:993:19)
I/flutter ( 8219): #5      _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:1111:38)
I/flutter ( 8219): #6      GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:183:24)
I/flutter ( 8219): #7      TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:598:11)
I/flutter ( 8219): #8      BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:287:5)
I/flutter ( 8219): #9      BaseTapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:259:7)
I/flutter ( 8219): #10     GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:157:27)
I/flutter ( 8219): #11     GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:362:20)
I/flutter ( 8219): #12     GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:338:22)
I/flutter ( 8219): #13     RendererBinding.dispatchEvent (package:flutter/src/rendering/binding.dart:267:11)
I/flutter ( 8219): #14     GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:295:7)
I/flutter ( 8219): #15     GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:240:7)
I/flutter ( 8219): #16     GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:213:7)
I/flutter ( 8219): #20     _invoke1 (dart:ui/hooks.dart:265:10)
I/flutter ( 8219): #21     _dispatchPointerDataPacket (dart:ui/hooks.dart:174:5)
I/flutter ( 8219): (elided 3 frames from dart:async)
I/flutter ( 8219): 
I/flutter ( 8219): Handler: "onTap"
I/flutter ( 8219): Recognizer:
I/flutter ( 8219):   TapGestureRecognizer#ca14c
I/flutter ( 8219): ════════════════════════════════════════════════════════════════════════════════════════════════════

[IronLad85]

@pb-iatros Ok i'll fix that