fix: handle getting channel by members with channel id explicitly undefined

[MartinCupela]

CLA

• [ X ] Code changes are tested

Description of the changes, What, Why and How?

The client.channel() method did not handle correctly client.channel(type, undefined, channelData) calls. Instead of trying to find channel by members it directly returned a brand new Channel instance. Also it tried to get channel by id, if id was explicitly set to undefined.

[github-actions]

Size Change: +217 B (0%)

Total Size: 318 kB

Filename	Size	Change
dist/browser.es.js	69.6 kB	+49 B (0%)
dist/browser.full-bundle.min.js	37.7 kB	+24 B (0%)
dist/browser.js	70.6 kB	+49 B (0%)
dist/index.es.js	69.7 kB	+50 B (0%)
dist/index.js	70.6 kB	+45 B (0%)

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