Graphics_Engine: Adding fallback method to IToSVGString(this IGeometry geometry)

[adecler]

Issues addressed by this PR

Closes #501

Test files

Simple code inspection is enough in this case

Additional comments

VS decided to automatically add a space between the if and he( but, other than that, this PR is only adding a fallback method without touching anything else.

[FraserGreenroyd]

Code reviewed and looks good, only spacing as mentioned and the fallback method which looks good for handling null and the type - happy to deploy.

[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 unit-tests
@BHoMBot check dataset-compliance
@BHoMBot check copyright-compliance
@BHoMBot check ready-to-merge

[bhombot-ci]

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

• check unit-tests
• check dataset-compliance
• check copyright-compliance
• check ready-to-merge

[FraserGreenroyd]

@BHoMBot this is a DevOps instruction. I am requesting neutral checks on: documentation-compliance, copyright-compliance

[bhombot-ci]

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