allow components without slots to have whitespace as only child

[Rich-Harris]

fixes #1007

[codecov-io]

Codecov Report

Merging #1017 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1017      +/-   ##
==========================================
+ Coverage   92.08%   92.09%   +<.01%     
==========================================
  Files         115      115              
  Lines        4297     4302       +5     
  Branches     1369     1373       +4     
==========================================
+ Hits         3957     3962       +5     
  Misses        147      147              
  Partials      193      193

Impacted Files	Coverage Δ
src/generators/nodes/Element.ts	94.88% <100%> (ø)	⬆️
src/generators/nodes/Text.ts	100% <100%> (ø)	⬆️
src/generators/nodes/shared/Node.ts	96.77% <100%> (ø)	⬆️

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[Conduitry]

This just restores 1.46.0 behavior, right? Any thoughts on how to handle sending slots into components that don't accept them? I'm kind of torn.

[Rich-Harris]

Correct. Opened a new issue about components without slots: #1020