Watchdog demo update

[mremiszewski]

Suggested merge commit message (convention)

Feature: Added catching and emitting errors that happen during editor initialization. Closes #392

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Additional information

R-: tests

[coveralls]

Pull Request Test Coverage Report for Build cd581a6f-f31b-4b06-ab88-001a36311ecf

• 6 of 6 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 9a9f9ad1-11f1-4bc2-8d65-64cd8d07bdc1:	0.0%
Covered Lines:	162
Relevant Lines:	162

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💛 - Coveralls

[pomek]

I asked @psmyrek to make a verification in an external project. Once it's ready, we can merge it and release.

[scofalik]

Tests require fixing.