[AAE-4311] Make sure we have unit test coverage of the error component.

[sivakumar414ram]

Please check if the PR fulfills these requirements

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (check one with "x")

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation
• Other... Please describe:

What is the current behaviour? (You can also link to an open issue here)

https://alfresco.atlassian.net/browse/AAE-4311

What is the new behaviour?

Does this PR introduce a breaking change? (check one with "x")

• Yes
• No

If this PR contains a breaking change, please describe the impact and migration path for existing applications: ...

Other information:

[codecov-io]

Codecov Report

Merging #6466 (777b0c8) into develop (2839e9f) will increase coverage by 1.05%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #6466      +/-   ##
===========================================
+ Coverage    76.26%   77.32%   +1.05%     
===========================================
  Files          868      147     -721     
  Lines        19623     4163   -15460     
  Branches      3907      830    -3077     
===========================================
- Hits         14966     3219   -11747     
+ Misses        3460      668    -2792     
+ Partials      1197      276     -921     

Impacted Files	Coverage Δ
...re/viewer/components/pdf-viewer-thumb.component.ts
.../lib/task/directives/claim-task-cloud.directive.ts
...ss-services/src/lib/task-list/models/form.model.ts
...ponents/widgets/attach-file/upload-cloud.widget.ts
...omponents/widgets/core/form-outcome-event.model.ts
...e/form/components/widgets/error/error.component.ts
...ices-cloud/src/lib/process/process-cloud.module.ts
...ights/src/lib/diagram/components/raphael/anchor.ts
...ib/core/search-text/search-text-input.component.ts
...eader/components/process-header-cloud.component.ts
... and 711 more

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