JSON like queries fail for KeywordsVocabulary

[szakitibi]

The json like query strings ([test] or {test}) doomed to fail for KeywordsVocabulary, due to the use of _parseJSON:

plone.app.content/plone/app/content/browser/vocabulary.py

Lines 93 to 102 in 68721f4

	def _parseJSON(s):
	# XXX this should be changed to a try loads except return s
	if isinstance(s, str):
	s = s.strip()
	if (s.startswith("{") and s.endswith("}")) or (
	s.startswith("[") and s.endswith("]")
	): # detect if json
	return json_loads(s)
	return s