Bug 1109080 - Re-schedule operation fails if example schedule was run before an operation definition change in plugin descriptor

Check if example parameters are null or pass validation.
Show warning message otherwise
BZ 1068816 - fix remote client to support remote plugin API
Merge remote-tracking branch 'origin/master' into feature/bz1069606-rebase-eap-63
BZ 1069606 - fix eclipse classpath now that server is on EAP 6.3