Diffing_Engine: InputObjectsNullOrEmpty method bugfixed

[pawelbaran]

Issues addressed by this PR

Closes #3146

Test files

Standard test procedure for diffing.

Changelog

Additional comments

[pawelbaran]

@BHoMBot check required

[bhombot-ci]

@pawelbaran 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

There are 27 requests in the queue ahead of you.

[alelom]

Approving based on code review. The code change makes sense and removes an incorrect assignment.

[FraserGreenroyd]

@BHoMBot check compliance

[bhombot-ci]

@FraserGreenroyd 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

[bhombot-ci]

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

[bhombot-ci]

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

[FraserGreenroyd]

@BHoMBot check installer

[bhombot-ci]

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

• check installer

[pawelbaran]

@BHoMBot check installer

[bhombot-ci]

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

• check installer

[FraserGreenroyd]

@BHoMBot this is a DevOps instruction. I am requesting neutral checks on: versioning, ready-to-merge, unit-tests

[bhombot-ci]

@FraserGreenroyd I have provided neutral checks to the checks requested. These checks will need to be run properly to obtain full results.