Let container output XLE log on errors

entrypoint.sh

@@ -21,7 +21,17 @@ echo "packed-xml-fs { $SENTENCE } packed-parses.xml" >> xlerc
 echo "exit" >> xlerc
 
 # Start XLE (under the X server), this will automatically load xlerc, let it complete the parse and end
-xvfb-run xle > /dev/null 2> /dev/null
+# Save the messages of xle to xle_messages.txt
+xvfb-run xle > xle_messages.txt 2> /dev/null
 
-# Print parse file to stdout
-cat packed-parses.xml
+
+if [[ -f packed-parses.xml ]]
+then
+    # Print parse file to stdout and exit with success
+    cat packed-parses.xml
+    exit 0
+else
+    # Print xle output to stdout and fail
+    cat xle_messages.txt
+    exit 1
+fi