fix: prevent unnecessary error throwing in stringifyRule

[megboehlert]

When a css import rule was being stringified (in stringifyRule) and the rule didn't have a styleSheet property at time of processing, an error would be thrown and passed up to stringifyStyleSheet where it was caught. Once caught, it would set null for the attributes._cssText property of the serializedNode. When watching the replay, these style elements would be empty instead of populated with the correct cssText.

[changeset-bot]

🦋 Changeset detected

Latest commit: df43bd6

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 19 packages

Name	Type
rrweb-snapshot	Patch
rrweb	Patch
rrdom	Patch
rrdom-nodejs	Patch
rrweb-player	Patch
@rrweb/all	Patch
@rrweb/replay	Patch
@rrweb/record	Patch
@rrweb/types	Patch
@rrweb/packer	Patch
@rrweb/utils	Patch
@rrweb/web-extension	Patch
rrvideo	Patch
@rrweb/rrweb-plugin-console-record	Patch
@rrweb/rrweb-plugin-console-replay	Patch
@rrweb/rrweb-plugin-sequential-id-record	Patch
@rrweb/rrweb-plugin-sequential-id-replay	Patch
@rrweb/rrweb-plugin-canvas-webrtc-record	Patch
@rrweb/rrweb-plugin-canvas-webrtc-replay	Patch

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