Fixed a 'NullPointerException' when TraceAnalysisParser was called to analyse a log file that didn't exist. Now returns a XMLParserException.
Fixed a 'NullPointerException' when TraceAnalysisParser was called to analyse a log file that didn't exist. Now returns a XMLParserException.

benb/beast-mcmc,benb/beast-mcmc,benb/beast-mcmc,benb/beast-mcmc,benb/beast-mcmc