JSONSchema with string of arrays is not validated correctely

[jma]

Description
For a required array property with a minimum of string items and each string has a minimal length. An empty model should not be valid.

Minimal Reproduction
Go to:

• https://stackblitz.com/edit/angular-array-required?file=src%2Fassets%2Fjson-schema%2Farrays.json

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Your Environment

• Angular version: X.Y.Z
• Formly version: X.Y.Z

Additional context
Add any other context about the problem here.

[aitboudad]

minLength should not ignore the empty string value in addition we need to add also type validator