A......... [ZBX-6151] fixed graph prototype and trigger prototype validation so item prototypes are no longer allowed from multiple discovery rules
A......... [ZBX-6151] fixed graph and graph prototype update validation allowing to pass only 'gitemid' parameter without 'itemid'

git-svn-id: svn://svn.zabbix.com/trunk@43306 f4e7fd02-d210-4e34-a1e0-d4093fb66cc2