don't create text nodes inside <:Head>

[Rich-Harris]

fixes #1026

[codecov-io]

Codecov Report

Merging #1054 into master will decrease coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master   #1054      +/-   ##
=========================================
- Coverage   92.02%     92%   -0.03%     
=========================================
  Files         121     121              
  Lines        4376    4377       +1     
  Branches     1410    1411       +1     
=========================================
  Hits         4027    4027              
  Misses        148     148              
- Partials      201     202       +1

Impacted Files	Coverage Δ
src/generators/nodes/Text.ts	100% <100%> (ø)	⬆️
src/generators/dom/Block.ts	97.32% <0%> (-0.9%)	⬇️

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