In basic test, skip age check if date cannot be parsed

SiteTests/testjob/tests/CE-cms-basic

@@ -232,9 +232,16 @@ if [ $rc == 0 ] ; then
     CommitInfoUrl="https://gitlab.cern.ch/api/v4/projects/siteconf%2F${SiteName}/repository/commits/${last_commit}"
     ./fetch-from-web-gitlab \"$CommitInfoUrl\" $FileInfoTmp
     FileDate=$(grep -Po '"authored_date":.*?[^\\]",' ${FileInfoTmp} | perl -pe 's/"authored_date"://; s/^"//; s/",$//')
-    let seconds=`date +%s`-`date +%s -d "$FileDate"`
-    let cvsFileAgeInHours=$seconds/3600
-    echo "GITTFCAge: ${cvsFileAgeInHours} hours"
+    echo "Commit date: $FileDate"
+    FileEpoch=`date +%s -d "$FileDate"`
+    if [ X$FileEpoch == X ] ; then
+	echo "Error in parsing commit date. Skipping the age check"
+	cvsFileAgeInHours=0
+    else
+	let seconds=`date +%s`-`date +%s -d "$FileDate"`
+	let cvsFileAgeInHours=$seconds/3600
+	echo "GITTFCAge: ${cvsFileAgeInHours} hours"
+    fi
     if [ $localTFCfileAgeInHours -gt 120 ] && [ $cvsFileAgeInHours -gt 120 ] ; then
       error=1
       echo "ERROR: local Trivial Catalog File file differ from GIT"