Can`t use it without schema 2

[pharindoko]

Describe the bug
which template:

• MaterialDesignFrameworkModule — Material Design
• Bootstrap3FrameworkModule — Bootstrap 3
• Bootstrap4FrameworkModule — Bootstrap 4
• NoFrameworkModule — plain HTML
• Other (please specify below)

A clear and concise description of what the bug is.

To Reproduce
Steps to reproduce the behavior:

Use plain json without schema
It fails to validate - schema is undefined

More details:

ajv.js

function validate(schemaKeyRef, data) {
	...
    v = this.getSchema(schemaKeyRef);
	...
}

ajv.js line 238
It compares keyRef = "http://json-schema.org/draft-06/schema# with "http://json-schema.org/draft-07/schema"

  return self._schemas[keyRef] || self._refs[keyRef] || self._fragments[keyRef];

result "undefined" will be returned

Error in line 92 will be thrown:

    if (!v) throw new Error('no schema with key or ref "' + schemaKeyRef + '"');

Expected behavior

The correct schema will be taken

Desktop (please complete the following information):

• OS: Windows 10
• Browser Chrome
• Angular 7

[hamzahamidi]

Noted I'll check this out asap

[hamzahamidi]

Duplicate #52