Fix NPE if not persistence services enabled
Merge pull request #895 from cdjackson/ui-chart

Fix NPE if no persistence services enabled [ESH]
changed version 1.5.0-SNAPSHOT

thanks David for investigating
changed version to 1.5.0-SNAPSHOT

thanks David for investigating
begin and end parameter for chart servlet added
remove git comment
date format added
debug logging added, DateFormat one statically initialised, improved comments and ouptuts
debug logging added, DateFormat one statically initialised, improved comments and ouptuts