Make sure there's a non-Zero-duration Home-time, before giving room i…

…n the output (so no newlines for non-existing entries

src/main/java/de/esterlino/timeplater/worktimes/ouputter/TemplateStringWorkWeekOutputter.java

@@ -19,11 +19,18 @@ public String createOutput(WorkWeek workWeek) {
         StringBuilder output = new StringBuilder();
 
         for (WorkDay day : workWeek.getWorkDays()) {
-            output.append(DateTimeFormatUtils.workDayFormat(day, workWeek.getCalendarWeek()));
-            output.append("\n");
+            appendDay(output, workWeek.getCalendarWeek(), day);
         }
 
         return new String(output);
     }
 
+    private void appendDay(final StringBuilder toAppendTo, final int calendarWeek, final WorkDay workDay) {
+        if (workDay.getHomeTime() == null || workDay.getHomeTime().getWorkDuration().isZero()) {
+            return;
+        }
+
+        toAppendTo.append(DateTimeFormatUtils.workDayFormat(workDay, calendarWeek));
+        toAppendTo.append("\n");
+    }
 }