Fix incorrect null check on Tag prior to Push via FullCRUD

[alelom]

Issues addressed by this PR

Closes #326

Fix an incorrect null check on tags. There was no guard against null values.

Test files

See #326

Changelog

Additional comments

[enarhi]

LGTM, tested with script where the null tag was causing a failed push and the push now works as expected.

[FraserGreenroyd]

@BHoMBot check required

[bhombot-ci]

@FraserGreenroyd to confirm, the following actions are now queued:

• check code-compliance
• check documentation-compliance
• check project-compliance
• check core
• check null-handling
• check serialisation
• check versioning
• check installer

[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.

[FraserGreenroyd]

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

[FraserGreenroyd]

Code change is sensible given the issue described and this should resolve it.

[bhombot-ci]

@FraserGreenroyd to confirm, the following actions are now queued:

• check copyright-compliance
• check ready-to-merge

There are 1 requests in the queue ahead of you.