fix: do not proceed call if getUserMedia fails
Description
Fixes https://gitlab.com/famedly/company/product-management/-/issues/1052, https://gitlab.com/famedly/company/product-management/-/issues/1046
Checklist
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I read the [Contributor Guide] and followed the process outlined there for submitting PRs. -
I updated/added relevant documentation (doc comments with ///). -
I did not add or update methods, functions or widgets without tests.