Fix empty structparent value in lua-mode

CHANGELOG.md

@@ -10,6 +10,9 @@ this project uses date-based 'snapshot' version identifiers.
 ### Added
  - structure destination is added OpenAction if present
  - viewer/startstructure key to setup the OpenAction structure.
+
+### Fixed
+ - missing structparent value if page is empty in lua-mode
 
 ## [2024-02-22]
 Version 0.98w

tagpdf-backend.dtx

@@ -1244,6 +1244,7 @@ function ltx.@@.func.fill_parent_tree_line (page)
      end
     else
       ltx.@@.trace.log ("INFO PARENTTREE-NO-DATA: page "..page,3)
+      numsentry = pdfpage.." []"
     end
     return numsentry
 end

testfiles-luatex/test-sectioning-koma.tpf

@@ -229,7 +229,9 @@ endobj
 endobj
 6 0 obj
 << /Nums [0 [ 10 0 R 13 0 R 14 0 R 15 0 R 17 0 R 18 0 R 20 0 R 21 0 R 22 0 R 24 0 R 25 0 R 26 0 R] 
+1 []
 2 [ 36 0 R 36 0 R] 
+3 []
 4 [ 43 0 R 44 0 R 44 0 R 45 0 R 45 0 R 46 0 R 47 0 R] 
 ] >>
 endobj
@@ -478,71 +480,71 @@ xref
 0000000003 00000 f 
 0000000004 00000 f 
 0000000008 00000 f 
-0000008760 00000 n 
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 0000000000 00000 f 
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+0000018030 00000 n 
 trailer
 << /Size 68 /Root 66 0 R /Info 67 0 R /ID [ <2350CAD05F8A7AF0AA4058486855344F> <2350CAD05F8A7AF0AA4058486855344F> ] >>
 startxref
-18156
+18164
 %%EOF