move finishWriting() to the common finally block

fixes #3373

Author: Vladimir Kotal

opengrok-indexer/src/main/java/org/opengrok/indexer/index/IndexDatabase.java

@@ -487,17 +487,17 @@ public void update() throws IOException {
                     reader.close();
                 }
             }
-
-            try {
-                finishWriting();
-            } catch (IOException e) {
-                finishingException = e;
-            }
         } catch (RuntimeException ex) {
             LOGGER.log(Level.SEVERE,
                 "Failed with unexpected RuntimeException", ex);
             throw ex;
         } finally {
+            try {
+                finishWriting();
+            } catch (IOException e) {
+                finishingException = e;
+            }
+
             completer = null;
             try {
                 if (writer != null) {