Fix audio_player throws exception when max value is 0

[ngthailam]

General:

Running on IOS simulator
Closes #980
Closes #981

Describe problem:

980:
Due to Slider assert constructor, when max == 0 and value == 0, it throws

The following assertion was thrown building CupertinoSlider(value: 0.0, min: 0.0, max: 0.0, dependencies: [_InheritedCupertinoTheme], state: _CupertinoSliderState#e94ea):
'package:flutter/src/cupertino/slider.dart': Failed assertion: line 334 pos 15: 'value >= 0.0 && value <= 1.0': is not true.

981:
Same issue, only when back to home_page, the slider max && value is reset to 0, causing the same exception but in a different screen

🔔 This affects not just the Demo app, but anywhere which has the same html element.

Changes:

• Add max == 0 check along with null check ( I see no difference in behavior after adding the 0 check )

UI Evidence:

Before:

Screen.Recording.2024-01-11.at.8.54.48.PM.mov

After

Screen.Recording.2024-01-11.at.8.55.08.PM.mov

[ngthailam]

@daohoangson Please have a look at the PR, simple fix but solves noticeable problem when running the Demo App.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (2dc197d) 99.58% compared to head (882ee43) 99.58%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1156   +/-   ##
=======================================
  Coverage   99.58%   99.58%           
=======================================
  Files          72       72           
  Lines        4334     4335    +1     
=======================================
+ Hits         4316     4317    +1     
  Misses         18       18           

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[daohoangson]

This is great! I have merged the PR, thank you very much.