Support minLength=0 on Yaml->Ts generator

[LsKoder]

Issue Description
Yaml->Ts Generator miss minLength=0 from Yaml Def and generate wrong types (just string instead of WithinRangeString)

Current Behavior

Yaml Source:

EmptyString:
      type: string
      minLength: 0
      maxLength: 0

LimitedString:
      type: string
      minLength: 0
      maxLength: 4000

Ts Output:

export type EmptyString = t.TypeOf<typeof EmptyString>;
export const EmptyString = t.string;

export type LimitedString= t.TypeOf<typeof LimitedString>;
export const LimitedString= t.string;

Expected/Correct Behavior
Ts Output:

export type EmptyString = t.TypeOf<typeof EmptyString>;
export const EmptyString = WithinRangeString(0, 1);

export type LimitedString= t.TypeOf<typeof LimitedString>;
export const LimitedString= WithinRangeString(0, 4001);

Solution:
Into macros.njk file, change
{% elif definition.minLength and definition.maxLength %}
TO
{% elif definition.minLength!==undefined and definition.maxLength!==undefined %}
In this way, 0 value will be recognized and used