fix(VTextField): prevent TypeError when color is an empty string

[KaelWD]

fixes #6981

vuetify/packages/vuetify/src/components/VTextField/VTextField.js

Line 300 in 189cbd2

color: this.validationState,

is coerced to true if VLabel has Boolean

How Has This Been Tested?

lol

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Improvement/refactoring (non-breaking change that doesn't add any feature but make things better)

[codecov]

Codecov Report

Merging #6982 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff           @@
##           master   #6982   +/-   ##
======================================
  Coverage    85.3%   85.3%           
======================================
  Files         298     298           
  Lines        7221    7221           
  Branches     1804    1804           
======================================
  Hits         6160    6160           
  Misses        960     960           
  Partials      101     101

Impacted Files	Coverage Δ
packages/vuetify/src/components/VLabel/VLabel.ts	100% <ø> (ø)	⬆️
...kages/vuetify/src/components/VRadioGroup/VRadio.js	100% <ø> (ø)	⬆️
...ckages/vuetify/src/components/VCounter/VCounter.ts	100% <100%> (ø)	⬆️

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