[BUGFIX] Fix issue with preview of workspaces in headless mode

[twoldanski]

Resolves #695

[coveralls]

Pull Request Test Coverage Report for Build 7758288685

• 0 of 10 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.1%) to 64.34%

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Totals
Change from base Build 7638644413:	0.1%
Covered Lines:	839
Relevant Lines:	1304

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💛 - Coveralls