allow zero length geometries

[rafaqz]

Description

Fixes #2819

Checks for zero length everywhere (I could find so far) that geom[1] etc is used.

Should I put tests in conversions.jl?

Type of change

Delete options that do not apply:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• Added an entry in NEWS.md (for new features and breaking changes)
• Added or changed relevant sections in the documentation
• Added unit tests for new algorithms, conversion methods, etc.
• Added reference image tests for new plotting functions, recipes, visual options, etc.

[SimonDanisch]

Should I put tests in conversions.jl?

Yes, that'd be lovely :)

[rafaqz]

Ok, let me know if those make sense

[SimonDanisch]

Merged in #2917