Query.DrawingArea - titleblock empty type bug fix

[michal-pekacki]

NOTE: Depends on

Issues addressed by this PR

Closes #1403

Added null check for empty symbol family types.

Test files

Changelog

Additional comments

[michal-pekacki]

@BHoMBot check required

[bhombot-ci]

@michal-pekacki to confirm, the following actions are now queued:

• check code-compliance
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• check core
• check null-handling
• check serialisation
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• check installer

[michal-pekacki]

@BHoMBot check installer

[bhombot-ci]

@michal-pekacki to confirm, the following actions are now queued:

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There are 2 requests in the queue ahead of you.

[bhombot-ci]

The check installer has already been run previously and recorded as a successful check. This check has not been run again at this time.

[pawelbaran]

Happy to approve, the change makes sense. However, @michal-pekacki could you please update the PR title? The change does not look like a null check to me 🙈

[michal-pekacki]

@BHoMBot check copyright-compliance
@BHoMBot check dataset-compliance
@BHoMBot check ready-to-merge

[bhombot-ci]

@michal-pekacki to confirm, the following actions are now queued:

• check copyright-compliance
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There are 8 requests in the queue ahead of you.