[Build] Fix collection of the first test results

The 'testresults' folder of a build drop already exists, even if no test
results are published yet.

Fixes #3386

Author: HannesWell

JenkinsJobs/Releng/collectTestResults.jenkinsfile

@@ -64,7 +64,7 @@ pipeline {
 
 						# Fetch previously collected test results and already generated files (that would otherwise be re-generated)
 						allTestResultsDirectory="${EP_ECLIPSE_DROPS}/${buildID}/testresults"
-						if ssh genie.releng@projects-storage.eclipse.org "[ -d '${allTestResultsDirectory}' ]"; then
+						if ssh genie.releng@projects-storage.eclipse.org "[ -d '${allTestResultsDirectory}/xml' ]"; then
 							# First delete result files from a previous run of the same configuration (in case that test configuration was run again).
 							ssh genie.releng@projects-storage.eclipse.org rm -rfv ${allTestResultsDirectory}/${triggeringJob}* ${allTestResultsDirectory}/*/*${triggeringJob}*
 							rsync -avzh genie.releng@projects-storage.eclipse.org:${allTestResultsDirectory}/xml ${buildDirectory}/testresults