Don't create empty markdown blocks

[prymitive]

No description provided.

[github-actions]

This pull request was validated by pint.

✔️ No problems found

Stats

Stat	Value
Version	v0.71.0-1-g52206b2
Number of rules parsed	7
Number of rules checked	7
Number of problems found	0
Number of offline checks	0
Number of online checks	0
Checks duration	0

Problems

No problems reported

[github-actions]

Benchmark diff:

goos: linux
goarch: amd64
pkg: github.com/cloudflare/pint/cmd/pint
cpu: AMD EPYC 7763 64-Core Processor                
              │   old.txt   │              new.txt               │
              │   sec/op    │   sec/op     vs base               │
FindEntries-4   37.21m ± 6%   37.20m ± 2%       ~ (p=1.000 n=10)
CheckRules-4     8.437 ± 2%    8.502 ± 2%       ~ (p=0.123 n=10)
geomean         560.3m        562.4m       +0.37%

              │   old.txt    │               new.txt               │
              │     B/op     │     B/op      vs base               │
FindEntries-4   29.20Mi ± 0%   29.20Mi ± 0%       ~ (p=0.971 n=10)
CheckRules-4    988.7Mi ± 0%   988.6Mi ± 0%       ~ (p=0.631 n=10)
geomean         169.9Mi        169.9Mi       -0.01%

              │   old.txt   │              new.txt               │
              │  allocs/op  │  allocs/op   vs base               │
FindEntries-4   136.0k ± 0%   136.0k ± 0%       ~ (p=0.646 n=10)
CheckRules-4    14.37M ± 0%   14.36M ± 0%       ~ (p=0.393 n=10)
geomean         1.398M        1.397M       -0.01%

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.62%. Comparing base (92ea8bf) to head (52206b2).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1334   +/-   ##
=======================================
  Coverage   95.62%   95.62%           
=======================================
  Files         108      108           
  Lines       14230    14230           
=======================================
  Hits        13608    13608           
  Misses        469      469           
  Partials      153      153           

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