Update to tx_nG6_db.php

The function add_purge_demand() will not update the run and analyzes
tables if a demand already exists for a given project. (See new trigger)

Issue #192

ui/nG6/lib/class.tx_nG6_db.php

@@ -359,18 +359,21 @@ class tx_nG6_db {
     
     	$GLOBALS['TYPO3_DB']->exec_INSERTquery('tx_nG6_purge_demand', $purge_data);
         $purge_demand_id = $GLOBALS['TYPO3_DB']->sql_insert_id();
-        tx_nG6_db::update_field('tx_nG6_run', $all_runs_ids, array('mail_sent_date','purge_demand_id'),array($date,$purge_demand_id));
-        tx_nG6_db::update_field('tx_nG6_analyze',$all_analyses_ids,array('mail_sent_date','purge_demand_id'),array($date,$purge_demand_id));
+        //If the trigger "check_demand_insert" is triggered, the previous request will return 0, so we have to prevents the updates to tx_nG6_run and tx_nG6_analyzes in that case
+		if( $purge_demand_id > 0){
+        	tx_nG6_db::update_field('tx_nG6_run', $all_runs_ids, array('mail_sent_date','purge_demand_id'),array($date,$purge_demand_id));
+        	tx_nG6_db::update_field('tx_nG6_analyze',$all_analyses_ids,array('mail_sent_date','purge_demand_id'),array($date,$purge_demand_id));
         
-        foreach($user_ids as $a_id){
+        	foreach($user_ids as $a_id){
                 $purge_data_user = array(
                         'tstamp'			=> 	$date,
-								'crdate'			=> 	$date,
+						'crdate'			=> 	$date,
                         'cruser_id'          =>	$cruser_id,
                         'purge_demand_id'    =>  $purge_demand_id,
                         'fe_users_id'        =>  $a_id
                 );
                 $GLOBALS['TYPO3_DB']->exec_INSERTquery('tx_nG6_purge_demand_fe_users', $purge_data_user);
+        	}
         }
     	return $purge_demand_id;
     }