fix describedby

[Djuvl]

modified: src/validator.js src/describedby.js

Q	A
Is bugfix?	✔️
New feature?	❌
Is backward-compatible?	❌
Tests pass?	✔️
Fixed issues	comma-separated list of tickets # fixed by the PR, if any
Updated README/docs?	❌
Added CHANGELOG entry?	❌

Fixes #1316

[germanbisurgi]

@Djuvl At line 723 the this.getWatchedFieldValues() method does not exist. If this line is left unchanged then the fix works.

[Djuvl]

The old code cause a null error, so i use the this.getWatchedFieldValues() method. I find the method in the master branch.

json-editor/src/editor.js

Lines 471 to 473 in e89c43d

	getWatchedFieldValues () {
	return this.watched_values
	}

ok, the method is not exist on the validator object. But simply left the old code unchanged is not a good way, as it will always get a undifined. The validator need to get the watched field realtime value, so the value can be pass to the ref template. I did not find a way to get the value in that function. At least the path to the schame is needed, so the watched value can be got from the jsoneditor object, i think. Is there any idea?