lots of ODA Warning: Invalid input
AcDb2dPolyline(16B9)
and AcDbBlockTableRecord ODA errors, because the 2nd to last elements in the entity chain have an empty next_entity handle. the last also has an empty prev_entity.

e.g. for 
vertex[0]: (3.2.16BA) abs:5818 [H* 0]
vertex[1]: (3.2.16BB) abs:5819 [H* 0]
vertex[2]: (3.2.16BC) abs:5820 [H* 0]
vertex[3]: (3.2.16BD) abs:5821 [H* 0]
seqend: (3.2.16BE) abs:5822 [H 0]

=>
prev_entity: (4.0.0) abs:0 [H 0]
next_entity: (4.2.16BB) abs:5819 [H 0]

prev_entity: (4.2.16BA) abs:5818 [H 0]
next_entity: (4.0.0) abs:0 [H 0]

prev_entity: (4.2.16BB) abs:5819 [H 0]
next_entity: (4.0.0) abs:0 [H 0]

prev_entity: (4.0.0) abs:0 [H 0]
next_entity: (4.0.0) abs:0 [H 0]

----
the intermediate should just have nolinks enabled, and first and last have 8.0.0. and 6.0.0 links
encode vertex chains. next_entity missing. in_postprocess_SEQEND
This is a GitHub Issue
repo:libredwg
owner:LibreDWG
Title : encode vertex chains. next_entity missing. in_postprocess_SEQEND
Issue date:

--- start body ---
lots of ODA Warning: Invalid input
AcDb2dPolyline(16B9)
and AcDbBlockTableRecord ODA errors, because the 2nd to last elements in the entity chain have an empty next_entity handle. the last also has an empty prev_entity.

e.g. for 
vertex[0]: (3.2.16BA) abs:5818 [H* 0]
vertex[1]: (3.2.16BB) abs:5819 [H* 0]
vertex[2]: (3.2.16BC) abs:5820 [H* 0]
vertex[3]: (3.2.16BD) abs:5821 [H* 0]
seqend: (3.2.16BE) abs:5822 [H 0]

=>
prev_entity: (4.0.0) abs:0 [H 0]
next_entity: (4.2.16BB) abs:5819 [H 0]

prev_entity: (4.2.16BA) abs:5818 [H 0]
next_entity: (4.0.0) abs:0 [H 0]

prev_entity: (4.2.16BB) abs:5819 [H 0]
next_entity: (4.0.0) abs:0 [H 0]

prev_entity: (4.0.0) abs:0 [H 0]
next_entity: (4.0.0) abs:0 [H 0]

----
the intermediate should just have nolinks enabled, and first and last have 8.0.0. and 6.0.0 links
--- end body ---
