fix not initialized variable

gen.sh

@@ -59,7 +59,7 @@ newdataentry () {
 	customdir=$(pwd)
 	fl=""
 	test $# -eq 0 && {
-		>&2 echo "determining entry based on data.xml.\n" 
+		>&2 echo "determining issue number based on data.xml.\n" 
 		lastentry=$(cat data.xml |grep -i "<schleuder id="|head -1|cut -d'"' -f2)
 		newentry=$(( $lastentry + 1 ))
 	} || {
@@ -80,6 +80,11 @@ newdataentry () {
 			# custom teaser xml-text, default: none
 				#~ t)
 				#~ teaser) ;;
+			# custom fs for files
+				#~ p)
+				#~ pdffs) ;;
+				#~ e)
+				#~ epubfs) ;;
 			# help text
 				#~ h)
 				#~ help)
@@ -111,7 +116,7 @@ newdataentry () {
 		} || { datetime=0; } # remaining arguments should be teaser xml-message.
 	}
 	echo "<schleuder id=\"$newentry\">"
-	test $datetime -eq 0 && {
+	test "${datetime}" = "" || test $datetime -eq 0 && {
 		#~ datetime=$(LANG=en_US.utf8 date -u +"%a %d %b %Y %H:%M") # manual copy of known entries
 		datetime=$(LANG=en_US.utf8 date -u -R |rev|cut -d":" -f2-|rev) # RFC-5322-Format without seconds and TZ
 	} || {