collect-data.sh: Added $FIRST_EXECUTION test(1)

Since there's no bandwidth usage data, the server would return an error if
the XML of a ProInfo machine was sent without the net usage data. To avoid
this "false positive", the agent won't sent the collected XML if
$FIRST_EXECUTION has any value different from "".

Signed-off-by: Erik Alexandre Pucci <eap08@c3sl.ufpr.br>
Acked-by: Klismann Smoger Mottin <ksm09@inf.ufpr.br>
Signed-off-by: Josiney de Souza <josineys@c3sl.ufpr.br>

collect-data.sh

@@ -68,7 +68,7 @@ if ! ${XMLPARSER} "${SCRIPTSDIR}" "${XMLFILENAME}"; then
 fi
 
 date +"%F %T - New inventory collected."
-if ! clientExec --inventory; then
+if test ! "${FIRST_EXECUTION}" && ! clientExec --inventory; then
     exit 7
 fi