Refine rawmsg destination

* Refine rawmsg destination test based on Bazsi's input

package/etc/conf.d/destinations/rawmsg_file.conf

@@ -1,12 +1,11 @@
 destination d_rawmsg {
     channel {
-        # Test for length of RAWMSG macro contents, minimum (meaning not set) appears to be "2"
-        filter { "$(length (${RAWMSG}))" != "2" };
-        destination {
-            file("/opt/syslog-ng/var/archive/rawmsg/${.splunk.sourcetype}/${HOST}/$YEAR-$MONTH-$DAY-message.log"
-            template("${RAWMSG}\n")
-#           template("Length of RAWMSG is: $(length (${RAWMSG})), RAWMSG is: <${RAWMSG}>\n")
-            );
+        if ("${RAWMSG}" ne "") {
+            destination {
+                file("/opt/syslog-ng/var/archive/rawmsg/${.splunk.sourcetype}/${HOST}/$YEAR-$MONTH-$DAY-message.log"
+                template("${RAWMSG}\n")
+                );
+            };
         };
     };
 };