From 16b9349a42eb3e142a2c8c71ccee1e75cf9deff4 Mon Sep 17 00:00:00 2001
From: Pascal Christoph <christoph@hbz-nrw.de>
Date: Fri, 27 Sep 2024 16:00:26 +0200
Subject: [PATCH] Don't insert a line break when nothing is processed (#543)

Complements a6a7fa8ccacdb8dcaa1daa2a9ece2d2f1047f440.
---
 .../org/metafacture/io/ObjectFileWriter.java  | 23 +++++++++++--------
 1 file changed, 13 insertions(+), 10 deletions(-)

diff --git a/metafacture-io/src/main/java/org/metafacture/io/ObjectFileWriter.java b/metafacture-io/src/main/java/org/metafacture/io/ObjectFileWriter.java
index f74629827..36d454266 100644
--- a/metafacture-io/src/main/java/org/metafacture/io/ObjectFileWriter.java
+++ b/metafacture-io/src/main/java/org/metafacture/io/ObjectFileWriter.java
@@ -90,18 +90,21 @@ public void setCompression(final String compression) {
     @Override
     public void process(final T obj) {
         assert !closed;
-        try {
-            if (firstObject) {
-                getWriter().write(getHeader());
-                firstObject = false;
+        final String objStr = obj.toString();
+        if (!objStr.isEmpty()) {
+            try {
+                if (firstObject) {
+                    getWriter().write(getHeader());
+                    firstObject = false;
+                }
+                else {
+                    getWriter().write(getSeparator());
+                }
+                getWriter().write(objStr);
             }
-            else {
-                getWriter().write(getSeparator());
+            catch (final IOException e) {
+                throw new MetafactureException(e);
             }
-            getWriter().write(obj.toString());
-        }
-        catch (final IOException e) {
-            throw new MetafactureException(e);
         }
     }