FormItem: fixed undefined of labelWidth

[shengpinghu]

No description provided.

[codecov-io]

Codecov Report

Merging #36 into dev will not change coverage.
The diff coverage is 0%.

@@          Coverage Diff          @@
##             dev     #36   +/-   ##
=====================================
  Coverage   46.6%   46.6%           
=====================================
  Files         93      93           
  Lines        972     972           
  Branches     154     154           
=====================================
  Hits         453     453           
  Misses       479     479           
  Partials      40      40

Impacted Files	Coverage Δ
packages/form/src/formItem.vue	4.34% <0%> (ø)	⬆️

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[joe223]

#31