Add null-check for request before checking SelectedItem on global search

[IsakNaslundBh]

Issues addressed by this PR

Closes #675

Adding simple null-check on request before trying to access SelectedItem. See issue as to why/when this has been slightly annoying issue.

Test files

Global search should still work.

Changelog

Additional comments

Cannot really see how this could have a negative impact on anything, but glad for a quick look @adecler

[IsakNaslundBh]

@BHoMBot check compliance @BHoMBot check required

[bhombot-ci[bot]]

@IsakNaslundBh to confirm, the following actions are now queued: - check `code-compliance` - check `documentation-compliance` - check `project-compliance` - check `branch-compliance` - check `dataset-compliance` - check `copyright-compliance` - check `code-compliance` - check `documentation-compliance` - check `project-compliance` - check `core` - check `null-handling` - check `serialisation` - check `versioning` - check `installer`

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[bhombot-ci[bot]]

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[IsakNaslundBh]

@BHoMBot check ready-to-merge

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@IsakNaslundBh to confirm, the following actions are now queued: - check `ready-to-merge`