Check for nullable keepAliveSubscription

[phuchuynhStrong]

Check for nullable keepAliveSubscription when disposing SocketClient.

Fixes

• Fixed dispose function of SocketClient, it didn't check the nullable keepAliveSubscription before put it into Future.wait. If SocketClientConfig constructed with null inactivityTimeout, keepAliveSubscription won't be initialized which results in the exception in Future.wait.

[codecov]

Codecov Report

Merging #772 (6adf61f) into beta (a3235a4) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             beta     #772      +/-   ##
==========================================
+ Coverage   50.48%   50.52%   +0.03%     
==========================================
  Files          34       34              
  Lines        1240     1241       +1     
==========================================
+ Hits          626      627       +1     
  Misses        614      614              

Flag	Coverage Δ
graphql_client	54.36% <100.00%> (+0.04%)	⬆️
graphql_flutter	31.57% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...lib/src/links/websocket_link/websocket_client.dart	73.65% <100.00%> (+0.15%)	⬆️

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[micimize]

if this is an issue it would be better to apply it to all the items in the list, as they all appear to be nullable. Something like Future.wait([...].where((closing) => closing != null)).toList())

[phuchuynhStrong]

Yup. It's better approach to handle this func. I updated the code.

[HofmannZ]

🎉 This PR is included in version 4.0.0-beta.6 🎉

The release is available on GitHub release

Your semantic-release bot 📦🚀

[HofmannZ]

🎉 This PR is included in version 4.0.0 🎉

The release is available on GitHub release

Your semantic-release bot 📦🚀